2024

18 papers were published in 2024.

Refereed Journal Articles

1. Oyama,S., Vanhamaki,H., Cai,L., Shinbori,A., Hosokawa,K., Sakanoi,T., et al.
Thermospheric wind response to March 2023 storm: Largest wind ever observed with a Fabry-Perot interferometer in Tromso, Norway since 2009.
Space Weather, 22, 2024.

2. Tanaka,Y., Ogawa,Y., Kadokura,A., Aso,T., Gustavsson,B., Brändström,U., Sergienko,T., Ueno,G., Saita,S.
Application of generalized aurora computed tomography to the EISCAT_3D project.
Annales Geophysicae, 42, 179–190, 2024.

3. Kirsti Kauristie, Octav Marghitu, Max van de Kamp, Theresa Hoppe, Ilja Honkonen, Adrian Blagau, Ionut Madalin Ivan, Mihail Codrescu, Aaron Ridley, Gábor Tóth, Yasunobu Ogawa, Lorenzo Trenchi
Joule Heating rate at high-latitudes by Swarm and ground-based observations compared to MHD simulations.
Journal of Atmospheric and Solar-Terrestrial Physics, 260, 2024.

4. Bag,T., Ogawa,Y.
Enhanced response of thermospheric cooling emission to negative pressure pulse.
Scientific Reports, 14, 9647, 2024.

5. Bag,T., Ogawa,Y.
Response time of Joule heating rate and nitric oxide cooling emission during geomagnetic storms: Correlated ground-based and satellite observations.
Journal of Geophysical Research: Space Physics, 129, 2024.

6. Nishiyama,T., Kagitani,M., Furutachi,S., et al.
The first simultaneous spectroscopic and monochromatic imaging observations of short-wavelength infrared aurora of N2+ Meinel (0,0) band at 1.1µm with incoherent scatter radar.
Earth, Planets and Space, 76, 30, 2024.

7. Dalin,P., Brändström,U., Kero,J., Voelger,P., Nishiyama,T., Trondsen,T., Wyatt,D., Unick,C., Perminov,V., Pertsev,N., Hedin,J.
A novel infrared imager for studies of hydroxyl and oxygen nightglow emissions in the mesopause above northern Scandinavia.
Atmospheric Measurement Techniques, 17, 1561–1576, 2024.

8. Sato,M., Shiokawa,K., Oyama,S.-i., Otsuka,Y., Shinbori,A., Oksanen,A.
Statistical analysis of low-latitude boundary of polar-type medium-scale traveling ionospheric disturbances observed by a 630-nm airglow imager at Nyrola, Finland.
Journal of Geophysical Research: Space Physics, 129, 2024.

9. Kato,Y., Shiokawa,K., Tanaka,Y., Ozaki,M., Kadokura,A., Oyama,S.-i., et al.
Longitudinal development of cosmic noise absorption based on multipoint observations at subauroral latitudes during storm-time substorms on 25–28 August 2018.
Journal of Geophysical Research: Space Physics, 129, 2024.

10. Herlingshaw,K., Partamies,N., van Hazendonk,C.M., Syrjäsuo,M., Baddeley,L., Johnsen,M., Eriksen,N.K., McWhirter,I., Aruliah,A.L., Engebretson,M.J., Oksavik,K., Sigernes,F., Lorentzen,D.A., Nishiyama,T., Cooper,M.B., Meriwether,J.W., Haaland,S., Whiter,D.K.
Science Highlights from the Kjell Henriksen Observatory on Svalbard.
Arctic Science, 3, 2024.

11. Ellahouny,N.M., Aikio,A.T., Vanhamäki,H., Virtanen,I.I., Cai,L., Marchaudon,A., et al.
EISCAT observations of depleted high-latitude F-region during an HSS/SIR-driven magnetic storm.
Journal of Geophysical Research: Space Physics, 129, 2024.

12. Cai,L., Aikio,A., Oyama,S., Ivchenko,N., Vanhamäki,H., Virtanen,I., et al.
Effect of polar cap patches on the high-latitude upper thermospheric winds.
Journal of Geophysical Research: Space Physics, 129, 2024.

13. Tikemani Bag, Y.Ogawa
Impact of interplanetary shock on nitric oxide cooling emission: A superposed epoch study.
Advances in Space Research, 74, 6012-6019, 2024.

14. Bag,T., Sivakumar,V., Ogawa,Y.
Impact of interplanetary shock on thermospheric cooling emission: A case study.
Journal of Geophysical Research: Space Physics, 129, 2024.

15. Sergeev,V.A., Stepanov,N.A., Ogawa,Y., Rozanov,E.V., Shukhtina,M.A.
Local time distribution and activity dependence of extreme electron densities in the auroral D-region as an image of energy-dependent energetic electron precipitation.
Journal of Geophysical Research: Space Physics, 129, 2024.

16. Nagatani,A., Y.Miyoshi, K.Asamura, L.M.Kistler, S.Nakamura, K.Seki, Y.Ogawa, I.shinohara
Variation of molecular ions in the inner magnetosphere observed by the Arase satellite.
Geophysical Research Letters, 51, 2024.

17. Ito,Y., Hosokawa,K., Ogawa,Y., Miyoshi,Y., Tsuchiya,F., Fukizawa,M., et al.
On the factors controlling the relationship between type of pulsating aurora and energy of pulsating auroral electrons: Simultaneous observations by Arase satellite, ground-based all-sky imagers and EISCAT radar.
Journal of Geophysical Research: Space Physics, 129, 2024.

18. Bag,T., Ogawa,Y., Sivakumar,V.
Thermospheric NO cooling during 2003 October “Halloween Storm”: Revisited.
Journal of Geophysical Research: Space Physics, 129, 2024.

2023

11 papers were published in 2023.

Refereed Journal Articles

1. Nozawa,S., Saito,T., D.Kawahara, S.Wada, T.T.Tsuda, S.Maeda, T.Takahashi, H.Fujiwara, V.L.Narayanan, T.Kawabata, M.G.Johnsen
A statistical study of convective and dynamic instabilities in the polar upper mesosphere above Tromsø.
Earth, Planets and Space, 75, 22, 2023.

2. Tian,X., Y.Yu, F.Gong, L.Ma, J.Cao, S.C.Solomon, P.R.Shreedevi, K.Shiokawa, Y.Otsuka, S.Oyama, Y.Miyoshi
Ionospheric modulation by EMIC wave-driven proton precipitation: Observations and simulations.
Journal of Geophysical Research: Space Physics, 128, 2023.

3. Oyama,S., Aikio,A., Sakanoi,T., et al.
Geomagnetic activity dependence and dawn-dusk asymmetry of thermospheric winds from 9-year measurements with a Fabry–Perot interferometer in Tromsø, Norway.
Earth Planets Space, 75, 70, 2023.

4. Oyama,S., Hosokawa,K., Vanhamäki,H., Aikio,A., Sakanoi,T., Cai,L., et al.
IMF dependence of midnight bifurcation in the thermospheric wind at an auroral latitude based on nine winter measurements in Tromsø, Norway.
Geophysical Research Letters, 50, 2023.

5. Hosokawa,K., Oyama,S.-I., Ogawa,Y., Miyoshi,Y., Kurita,S., Teramoto,M., et al.
A ground-based instrument suite for integrated high-time resolution measurements of pulsating aurora with Arase.
Journal of Geophysical Research: Space Physics, 128, 2023.

6. Nanjo,S., Ebukuro,S., Nakamura,S., Miyoshi,Y., Kurita,S., Oyama,S.-i., et al.
An implication of detecting the internal modulation in a pulsating aurora: A conjugate observation by the Arase satellite and all-sky imagers.
Journal of Geophysical Research: Space Physics, 128, 2023.

7. Murase,K., Kataoka,R., Nishiyama,T., Sato,K., Tsutsumi,M., Tanaka,Y., et al.
Atmospheric ionizations by solar X-rays, solar protons, and radiation belt electrons in September 2017 space weather event.
Space Weather, 21, 2023.

8. Fukizawa,M., Tanaka,Y., Ogawa,Y., Hosokawa,K., Raita,T., Kauristie,K.
Three-dimensional ionospheric conductivity associated with pulsating auroral patches: reconstruction from ground-based optical observations.
Annales Geophysicae, 41, 511–528, 2023.

9. Matuura,N., Fujii,R., Nozawa,S.
History of EISCAT – Part 6: the participation of Japan in the EISCAT Scientific Association.
History of Geo- and Space Sciences, 14, 61–69, 2023.

10. Sato,K., Tomikawa,Y., Kohma,M., Yasui,R., Koshin,D., Okui,H., Watanabe,S., Miyazaki,K., Tsutsumi,M., Murphy,D., Meek,C., Tian,Y., Ern,M., Baumgarten,G., Chau,J.L., Chu,X., Collins,R., Espy,P.J., Hashiguchi,H., Kavanagh,A.J., Latteck,R., Lübken,F.-J., Milla,M., Nozawa,S., Ogawa,Y., Shiokawa,K., Alexander,M.J., Nakamura,T.
Interhemispheric Coupling Study by Observations and Modelling (ICSOM): Concept, Campaigns, and Initial Results.
Journal of Geophysical Research: Atmospheres, 128, 2023.

11. Katoh,Y., P.Rosendahl, Y.Ogawa, Y.Hiraki, H.Tadokoro
Effect of the mirror force on the collision rate due to energetic electron precipitation: Monte Carlo simulations.
Earth, Planets and Space, 75, 117, 2023.

2022

11 papers were published in 2022.

Refereed Journal Articles

1. Oyama,S., H.Vanhamäki, L.Cai, A.Aikio, M.Rietveld, Y.Ogawa, T.Raita, M.Kellinsalmi, K.Kauristie, B.Kozelov, A.Shinbori, K.Shiokawa, T.T.Tsuda, T.Sakanoi
Thermospheric wind response to a sudden ionospheric variation in the trough: Event at a pseudo breakup during geomagnetically quiet conditions.
Earth, Planets and Space,74, 154, 2022.

2. Fukizawa,M., T.Sakanoi, Y.Tanaka, Y.Ogawa, K.Hosokawa, B.Gustavsson, K Kauristie, A.Kozlovsky, T.Raita, U.Brändström, T.Sergienko
Reconstruction of precipitating electrons and three-dimensional structure of a pulsating auroral patch from monochromatic auroral images obtained from multiple observation points.
Annales Geophysicae, 40, 475–484, 2022.

3. Nanjo,S., S.Nozawa, M.Yamamoto, T.Kawabata, M.G.Johnsen, T.T.Tsuda, K.Hosokawa
An Automated Auroral Detection System Using Deep Learning: Real-time Operation in Tromsoe, Norway.
Scientific Reports, 12, 8038, 2022.

4. Chen,L., K.Shiokawa, Y.Miyoshi, S.Oyama, C.‐W.Jun, Y.Ogawa, K.Hosokawa, Y.Inaba, Y.Kazama, S.Y.Wang, S.W.Y.Tam, T.F.Chang, B.J.Wang, K.Asamura, S.Kasahara, S.Yokota, T.Hori, K.Keika, Y.Kasaba, A.Kumamoto, F.Tsuchiya, M.Shoji, Y.Kasahara, A.Matsuoka, I.Shinohara, S.Imajo, S.Nakamura, M.Kitahara
Observation of source plasma and field variations of a substorm brightening aurora at L~6 by a ground-based camera and the Arase satellite on 12 October 2017.
Journal of Geophysical Research: Space Physics, 127, 2022.

5. Stober,G., A.Liu, A.Kozlovsky, Z.Qiao, A.Kuchar, C.Jacobi, C.Meek, D.Janches, G.Liu, M.Tsutsumi, N.Gulbrandsen, S.Nozawa, M.Lester, E.Belova, J.Kero, N.Mitchell
Meteor Radar vertical wind observation biases and mathematical debiasing strategies including a 3DVAR+DIV algorithm.
Atmos.Meas.Tech., 15, 5769-5792, 2022.

6. Kavanagh,A., Y.Ogawa, E.E.Woodfield
Two techniques for determining F-region Ion Velocities at meso-scales: differences and impacts on Joule heating.
Journal of Geophysical Research: Space Physics, 127, 2022.

7. Tesfaw H.W., I.I.Virtanen, A.Aikio, A.Nel, M.Kosch, Y.Ogawa
Precipitating electron energy spectra and auroral power estimation by incoherent scatter radar with high temporal resolution.
Journal of Geophysical Research: Space Physics, 127, 2022.

8. Bosse,L., J.lilensten, M.G.Johnsen, N.Gillet, S.Rochat, A.Delboulbé, S.Curaba, Y.Ogawa, P.Derverchère, S.Vauclair
The polarisation of auroral emissions: A tracer of the E region ionospheric currents.
Journal of Space Weather and Space Climate, 12, 17, 2022.

9. Tesema,F., N.Partamies, D.K.Whiter, Y.Ogawa
Types of pulsating aurora: Comparison of model and EISCAT electron density observations.
Annales Geophysicae, 40, 1-10, 2022.

10. Safargaleev,V., Sergienko,T., Hosokawa,K., et al.
Altitude of pulsating arcs as inferred from tomographic measurements.
Earth, Planets and Space, 74, 31, 2022.

11. Yamauchi,M., De Keyser,J., Parks,G., et al.
Plasma-neutral gas interactions in various space environments: Assessment beyond simplified approximations as a Voyage 2050 theme.
Experimental Astronomy, 54, 521–559, 2022.

2021

12 papers were published in 2021.

Refereed Journal Articles

1. Nishiyama,T., M.Taguchi, H.Suzuki, P.Dalin, Y.Ogawa, U.Brandstrom, T.Sakanoi
Temporal evolutions of N2+ Meinel (1,2) band near 1.5 μm associated with aurora breakup and their effects on mesopause temperature estimations from OH Meinel (3,1) band.
Earth, Planets and Space, 73, 30, 2021.

2. Hosokawa,K., Y.Miyoshi, S.-I.Oyama, Y.Ogawa, S.Kurita, Y.Kasahara, Y.Kasaba, S.Yagitani, S.Matsuda, M.Ozaki, F.Tsuchiya, A.Kumamoto, T.Takashima, I.Shinohara, R.Fujii
Over-darkening of pulsating aurora.
Journal of Geophysical Research: Space Physics, 126, 2021.

3. Sugo,S., O.Kawashima, S.Kasahara, K.Asamura, R.Nomura, Y.Miyoshi, Y.Ogawa, K.Hosokawa, T. Mitani, T.Namekawa, T.Sakanoi, M.Fukizawa, N.Yagi, Y.Fedorenko, A. Nikitenko, S.Yokota, K.Keika, T.Hori, C.Koehler
Energy-resolved detection of precipitating electrons of 30-100 keV by a sounding rocket associated with dayside chorus waves.
Journal of Geophysical Research: Space Physics, 126, 2021.

4. Takada,M., K.Seki, Y.Ogawa, K.Keika, S.Kasahara, S.Yokota, T.Hori, K.Asamura, Y.Miyoshi, I.Shinohara
Low-altitude ion upflow observed by EISCAT and its effects on supply of molecular ions in the ring current detected by Arase (ERG).
Journal of Geophysical Research: Space Physics, 126, 2021.

5. Fukizawa,M., Sakanoi,T., Ogawa,Y., Tsuda,T.T., Hosokawa,K.
Statistical study of electron density enhancements in the ionospheric F region associated with pulsating auroras.
Journal of Geophysical Research: Space Physics, 126, 2021.

6. Kawamura,M., Sakanoi,T., Fukizawa,M., Miyoshi,Y., Hosokawa,K., Tsuchiya,F., et al.
Simultaneous pulsating aurora and microburst observations with ground-based fast auroral imagers and CubeSat FIREBIRD-II.
Geophysical Research Letters, 48, 2021.

7. Miyamoto,T., Oyama,S.-i., Raita,T., Hosokawa,K., Miyoshi,Y., Ogawa,Y., Kurita,S.
Variations in cosmic noise absorption in association with equatorward development of the pulsating auroral patch: A case study to estimate the energy spectra of auroral precipitating electrons.
Journal of Geophysical Research: Space Physics, 126, 2021.

8. Miyoshi,Y., Hosokawa,K., Kurita,S., et al.
Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae.
Sci Rep, 11, 13724, 2021.

9. Stepanov,N.A., Sergeev,V.A., Shukhtina,M.A., Ogawa,Y., Chu,X., Rogov,D.D.
Ionospheric electron density and conductance changes in the auroral zone during substorms.
Journal of Geophysical Research: Space Physics, 126, 2021.

10. Namekawa,T., Mitani,T., Asamura,K., Miyoshi,Y., Hosokawa,K., Ogawa,Y., et al.
Rocket observation of sub-relativistic electrons in the quiet dayside auroral ionosphere.
Journal of Geophysical Research: Space Physics, 126, 2021.

11. Kagawa,A., Hosokawa,K., Ogawa,Y., Ebihara,Y., Kadokura,A.
Occurrence distribution of polar cap patches: dependences on UT, season and hemisphere.
Journal of Geophysical Research: Space Physics, 126, 2021.

12. Bjoland,L.M., Ogawa,Y., Løvhaug,U.P., Lorentzen,D.A., Hatch,S.M., Oksavik,K.
Electron density depletion region observed in the polar cap ionosphere.
Journal of Geophysical Research: Space Physics, 126, 2021.

2020

9 papers were published in 2020.

Refereed Journal Articles

1. Nishimura,Y., M.R.Lessard, Y.Katoh, Y.Miyoshi, E.Grono, N.Partamies, N.Sivadas, K.Hosokawa, M.Fukizawa, M.Samara, R.G.Michell, R.Kataoka, T.Sakanoi, D.K.Whiter, S.Oyama, Y.Ogawa, S.Kurita
Diffuse and Pulsating Aurora.
Space Science Reviews, 216, 4, 2020.

2. Kawamura,Y., K.Hosokawa, S.Nozawa, Y.Ogawa, T.Kawabata, S.Oyama, Y.Miyoshi, S.Kurita, R.Fujii
Estimation of the emission altitude of pulsating aurora by using the five-wavelength photometer.
Earth, Planets and Space, 72, 96, 2020.

3. Hosokawa,K., Kullen,A., Milan,S., et al.
Aurora in the Polar Cap: A Review.
Space Science Reviews, 216, 15, 2020.

4. Hosokawa,K., Y.Miyoshi, M.Ozaki, S.Oyama, Y.Ogawa, S.Kurita, Y.Kasahara, Y.Kasaba, S.Yagitani, S.Matsuda, F.Tsuchiya, A.Kumamoto, R.Kataoka, K.Shiokawa, T.Raita, E.Turunen, T.Takashima, I.Shinohara, R.Fujii
Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves.
Scientific Reports, 10, 3380, 2020.

5. Oyama,S., A.Shinbori, Y.Ogawa, M.Kellinsalmi, T.Raita, A.Aikio, H.Vanhamaki, K.Shiokawa, I.Virtanen, L.Cai, A.B.Workayehu, M.Pedersen, K.Kauristie, T.T.Tsuda, B.Kozelov, A.Demekhov, A.Yahnin, F.Tsuchiya, A.Kumamoto, Y.Kasahara, A.Matsuoka, M.Shoji, M.Teramoto, M.Lester
An ephemeral red arc appeared at 68° MLat at a pseudo breakup during geomagnetically quiet conditions.
Journal of Geophysical Research: Space Physics, 125, 2020.

6. Ogawa,Y., Y.Tanaka, A.Kadokura, K.Hosokawa, Y.Ebihara, T.Motoba, B.Gustavsson, U.Brandstrom, Y.Sato, S.Oyama, M.Ozaki, T.Raita, F.Sigernes, S.Nozawa, K.Shiokawa, M.Kosch, K.Kauristie, C.Hall, S.Suzuki, Y.Miyoshi, A.Gerrard, H.Miyaoka, R.Fujii
Development of low-cost multi-wavelength imager system for studies of aurora and airglow.
Polar Science, 23, 2020.

7. Tsuda,T.T., Li,C., Hamada,S., Hosokawa,K., Oyama,S., Nozawa,S., et al.
OI 630.0‐nm and N2 1PG emissions in pulsating aurora events observed by an optical spectrograph at Tromsø, Norway.
Journal of Geophysical Research: Space Physics, 125, 2020.

8. Billett,D.D., K.Hosokawa, A.Grocott, J.A.Wild, A.L.Aruliah, Y.Ogawa, S.Taguchi
Multi-instrument Observations of Ion-Neutral Coupling in the Dayside Cusp.
Geophysical Research Letters, 47, 2020.

9. Bjoland,L.M., Y.Ogawa, U.Lovhaug, D.Lorentzen, S.M.Hatch, K.Oksavik
Electron density depletion region observed in the polar cap ionosphere.
Journal of Geophysical Research: Space Physics, 126, 2020.

2019

7 papers were published in 2019.

Refereed Journal Articles

1. Taguchi,S., K.Hosokawa, Y.Ogawa
Plasma Flow in the North-South Aligned Discrete Aurora Equatorward of the Cusp.
Journal of Geophysical Research: Space Physics, 124, 10778-10793, 2019.

2. Takahashi,T., I.Virtanen, K.Hosokawa, Y.Ogawa, A.Aikio, H.Miyaoka, A.Kero
Polarization electric field inside auroral patches: Simultaneous experiment of EISCAT radars and KAIRA.
Journal of Geophysical Research: Space Physics, 124, 3543-3557, 2019.

3. Ogawa,Y., K.Seki, K.Keika, Y.Ebihara
Characteristics of CME- and CIR-driven ion upflows in the polar ionosphere.
Journal of Geophysical Research: Space Physics, 124, 3637-3649, 2019.

4. Kozlovsky,A., S.Shalimov, S.Oyama, K.Hosokawa, M.Lester, Y.Ogawa, C.Hall
Ground Echoes Observed by the Meteor Radar and High-Speed Auroral Observations in the Substorm Growth Phase.
Journal of Geophysical Research: Space Physics, 124, 9278-9292, 2019.

5. Xu,H., Shiokawa,K., Oyama,S., Nozawa,S.
High-latitude thermospheric wind study using a Fabry-Perot interferometer at Tromsø in Norway: averages and variations during quiet times.
Earth, Planets and Space, 71, 110, 2019

6. Xu,H., K.Shiokawa, S.Oyama, Y.Otsuka
Thermospheric wind variations observed by a Fabry-Perot interferometer at Tromsø, Norway, at substorm onsets.
Earth, Planets and Space, 71, 93, 2019.

7. Cai,L., Oyama,S., Aikio,A., Vanhamäki,H., Virtanen,I.
Fabry-Perot interferometer observations of thermospheric horizontal winds during magnetospheric substorms.
Journal of Geophysical Research: Space Physics, 124, 3709-3728, 2019.

2018

5 papers were published in 2018.

Refereed Journal Articles

1. Nozawa,S., T.Kawabata, K.Hosokawa, Y.Ogawa, T.T.Tsuda, A.Mizuno, R.Fujii, C.M.Hall
A new five-wavelength photometer operated in Tromsø (69.6ºN, 19.2ºE).
Earth, Planets and Space,70, 193, 2018.

2. Oyama,S., T.T.Tsuda, K.Hosokawa, Y.Ogawa, Y.Miyoshi, S.Kurita, A.E.Kero, R.Fujii, Y.Tanaka, A.Mizuno, T.Kawabata, B.Gustavsson, T.Leyser
Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm.
Earth, Planets and Space, 70, 166, 2018.

3. Tsuda,T.T., M.T.Rietveld, M.J.Kosch, S.Oyama, Y.Ogawa, K.Hosokawa, S.Nozawa, T.Kawabata, A.Mizuno
Survey of conditions for artificial aurora experiments by the second electron gyro-harmonic at EISCAT Tromsø using dynasonde data.
Earth, Planets and Space, 70, 94, 2018.

4. Tsuda,T.T., M.T.Rietveld, M.J.Kosch, S.Oyama, K.Hosokawa, S.Nozawa, T.Kawabata, A.Mizuno, Y.Ogawa
Survey of conditions for artificial aurora experiments at EISCAT Tromsø using dynasonde data.
Earth, Planets and Space, 70, 40, 2018.

5. Virtanen,I.I., B.Gustavsson, A.Aikio, A.Kero, K.Asamura, Y.Ogawa
Electron energy spectrum and auroral power estimation from incoherent scatter radar measurements.
Journal of Geophysical Research: Space Physics, 123, 6865-6887, 2018.

2017

9 papers were published in 2017.

Refereed Journal Articles

1. Oyama,S., Kubota,K., Morinaga,T., Tsuda,T.T., Kurihara,J., Larsen,M.F., M.Yamamoto, L.Cai
Simultaneous FPI and TMA measurements of the lower thermospheric wind in the vicinity of the poleward expanding aurora after substorm onset.
Journal of Geophysical Research: Space Physics, 122, 10864 -10875, 2017.

2. Oyama,S., A.Kero, C.J.Rodger, M.A.Clilverd, Y.Miyoshi, N.Partamies, E.Turunen, T.Raita, P.T.Verronen, S.Saito
Energetic electron precipitation and auroral morphology at the substorm recovery phase.
Journal of Geophysical Research: Space Physics, 122, 6508-6527, 2017.

3. Takahashi,T., K.Hosokawa, S.Nozawa, T.T.Tsuda, Y.Hiraki, J.Sakai, Y.Ogawa, M.Tsutsumi, H.Fujiwara, T.D.Kawahara, N.Saito, S.Wada, T.Kawabata, C.Hall
Depletion of mesospheric sodium during extended period of pulsating aurora.
Journal of Geophysical Research: Space Physics, 122, 1212-1220, 2017.

4. Bjoland,L.M., Y.Ogawa, C.Hall, M.Rietveld, U.P.Lovhaug, C.La Hoz, H.Miyaoka
Long-term variations and trends in the polar E-region.
Journal of Atmospheric and Solar-Terrestrial Physics, 163, 85-90, 2017.

5. Taguchi,S., Y.Chiba, K.Hosokawa, Y.Ogawa
Horizontal profile of a moving red line cusp aurora.
Journal of Geophysical Research: Space Physics, 122, 3509-3525, 2017.

6. Yamazaki,Y., M.J.Kosch, Y.Ogawa
Average field-aligned ion velocity over the EISCAT radars.
Journal of Geophysical Research: Space Physics, 122, 5630-5642, 2017.

7. Adachi,K., S.Nozawa, Y.Ogawa, A.Brekke,. M.Hall, R.Fujii
Evaluation of a method to derive ionospheric conductivities using two auroral emissions (428 and 630 nm) measured with a photometer at Tromsoe (69.6°N).
Earth, Planets and Space, 69, 90, 2017.

8. Sergeeva,V., N.Stepanova, Y.Ogawa, S.Kakic, K.Kauristie
Solar wind dependence of electric conductances and currents in the auroral zone.
Journal of Atmospheric and Solar-Terrestrial Physics, 177, 38-45, 2017.

9. Ivchenko,N., N.Schlatter, H.Dahlgren, Y.Ogawa, Y.Sato, I.Haggstrom
Plasma line observations from the EISCAT Svalbard Radar during the International Polar Year.
Annales Geophysicae, 35, 1143-1149, 2017.

2016

7 papers were published in 2016.

Refereed Journal Articles

1. Oyama,S.-i., K.Shiokawa, Y.Miyoshi, K.Hosokawa, B.J.Watkins, J.Kurihara, T.T.Tsuda, C.T.Fallen
Lower thermospheric wind variations in auroral patches during the substorm recovery phase.
Journal of Geophysical Research: Space Physics, 121, 3564-3577, 2016.

2. Miyoshi,Y., S.Oyama, S.Saito, S.Kurita, H.Fujiwara, R.Kataoka, Y.Ebihara, C.Kletzing, G.Reeves, O.Santolik, M.Clilverd, C.J.Rodger, E.Turunen, F.Tsuchiya
Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations.
Journal of Geophysical Research: Space Physics, 120, 2754-2766, 2016.

3. Tsuda,T., M.Yamamoto, H.Hashiguchi, K.Shiokawa, Y.Ogawa, S.Nozawa, H.Miyaoka A.Yoshikawa
A proposal on the study of solar-terrestrial coupling processes with atmospheric radars and ground-based observation network.
Radio Science, 51, 1587-1599, 2016.

4. Yamazaki,Y., M.J.Kosch, Y.Ogawa, D.R.Themens
High-latitude Ion Temperature Climatology during the International Polar Year 2007-2008.
Journal of Space Weather and Space Climate, 6, A35, 13, 2016.

5. Turunen,E., A.Kero, P.T.Verronen, Y.Miyoshi, S.-I.Oyama, S.Saito
Mesospheric ozone destruction by high-energy electron precipitation associated with pulsating auora.
Journal of Geophysical Research: atmospheres, 121, 11852-11861, 2016.

6. Hosokawa,K., S.Taguchi, Y.Ogawa
Edge of polar cap patches.
Journal of Geophysical Research: Space Physics, 121, 3410-3420, 2016.

7. Hosokawa,K., S.Taguchi, Y.Ogawa
Periodic creation of polar cap patches from auroral transients in the cusp.
Journal of Geophysical Research: Space Physics, 121, 5639-5652, 2016.

2015

8 papers were published in 2015.

Refereed Journal Articles

1. Miyoshi,Y., S.Oyama, S.Saito, S.Kurita, H.Fujiwara, R.Kataoka, Y.Ebihara, C.Kletzing, G.Reeves, O.Santolik, M.Cliverd, C.J.Rodger, E.Turunen, F.Tsuchiya
Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations.
Journal of Geophysical Research: Space Physics, 120, 2754-2766, 2015.

2. Ieda,A., S.Oyama, H.Vanhamäki, R.Fujii, A.Nakamizo, O.Amm, T.Hori, M.Takeda, G.Ueno, A.Yoshikawa, R.J.Redmon, W.F.Denig, Y.Kamide, N.Nishitani
Approximate forms of daytime ionospheric conductance.
Journal of Geophysical Research: Space Physics, 119, 10397-10415, 2014.

3. Takahashi,T., S.Nozawa, T.T.Tsuda, Y.Ogawa, N.Saito, T.Hidemori, T.D.Kawahara, C.Hall, H.Fujiwara, N.Matuura, A.Brekke, M.Tsutsumi, S.Wada, T.Kawabata, S.Oyama, R.Fujii
A case study on generation mechanisms of a sporadic sodium layer above Tromso (69.6°N) during a night of high auroral activity.
Annales Geophysicae, 33, 941-953, 2015.

4. Hosokawa,K. Y.Ogawa
Ionospheric variation during pulsating aurora.
Journal of Geophysical Research: Space Physics, 120, 5943-5957, 2015.

5. Taguchi,S., K.Hosokawa, Y.Ogawa
Three-dimensional imaging of the plasma parameters of a moving cusp aurora.
Journal of Atmospheric and Solar-Terrestrial Physics, 133, 98-110, 2015.

6. Ishida,T., Y.Ogawa, A.Kadokura, K.Hosokawa, Y.Otsuka
Direct observations of blob deformation during a substorm.
Annales Geophysicae, 33, 525-530, 2015.

7. Taguchi,S., K.Hosokawa Y.Ogawa
Investigating the particle precipitation of a moving cusp aurora using simultaneous observations from the ground and space.
Progress in Earth and Planetary Science, 2, 11, 2015.

8. McCrea,I.W., A.Aikio, L.Alfonsi, E.Belova, S.Buchert, M.Clilverd, N.Engler, B.Gustavsson, C.Heinselman, J.Kero, M.Kosch, H.Lamy, T.Leyser, Y.Ogawa, K.Oksavik, A.Pellinen-Wannberg, F.Pitout, M.Rapp, I.Stanislawska, J.Vierninen
The science case for the EISCAT_3D radar.
Progress in Earth and Planetary Science, 2, 21, 2015.
日本語要約

2014

12 papers were published in 2014.

Refereed Journal Articles

1. Takahashi,T., S.Nozawa, M.Tsutsumi, C.Hall, S.Suzuki, T.T.Tsuda, T.D.Kawahara, N.Saito, S.Oyama, S.Wada, T.Kawabata, H.Fujiwara, A.Brekke, A.Manson, C.Meek, R.Fujii
A case study of gravity wave dissipation in the polar MLT region using sodium LIDAR and radar data.
Annales Geophysicae, 32, 1195-1205, 2014.

2. Shiokawa,K., A.Hashimoto, T.Hori, K.Sakaguchi, Y.Ogawa, E.Donovan, E.Spanswick, M.Connors, Y.Otsuka, S.-I.Oyama, S.Nozawa, K.McWilliams
Auroral fragmentation into patches.
Journal of Geophysical Research: Space Physics, 119, 8249-8261, 2014.

3. Fujiwara,H., S.Nozawa, Y.Ogawa, R.Kataoka, Y.Miyoshi, H.Jin, H.Shinagawa
Extreme ion heating in the dayside ionosphere in response to the arrival of a coronal mass ejection on 12 March 2012.
Annales Geophysicae, 32, 831-839, 2014.

4. Ishida,T., Y.Ogawa, A.Kadokura, Y.Hiraki, I.Haggstrom
Seasonal variation and solar activity dependence of the quiet-time ionospheric trough.
Journal of Geophysical Research: Space Physics, 119, 6774-6783, 2014.

5. Ogawa,Y., T.Motoba, S.C.Buchert, I.Haggstrom, S.Nozawa
Upper atmosphere cooling over the past 33 years.
Geophysical Research Letters, 41, 5629-5635, 2014.

6. Oyama,S., Y.Miyoshi, K.Shiokawa, J.Kurihara, T.T.Tsuda, B.J.Watkins
Height-dependent ionospheric variations in the vicinity of nightside poleward expanding aurora after substorm onset.
Journal of Geophysical Research: Space Physics, 119, 4146-4156, 2014.

7. Sakai,J., K.Hosokawa, S.Taguchi, Y.Ogawa
Storm-time enhancements of 630.0-nm airglow associated with polar cap patches.
Journal of Geophysical Research: Space Physics, 119, 2214-2228, 2014.

8. Nozawa,S., T.Kawahara, N.Saito, C.Hall, T.Tsuda, T.Kawabata, S.Wada, A.Brekke, T.Takahashi, H.Fujiwara, Y.Ogawa, R.Fujii
Variations of the neutral temperature and sodium density between 80 and 107km above Tromsoe during the winter of 2010-2011 by a new solid state sodium lidar.
Journal of Geophysical Research: Space Physics, 119, 441-451, 2014.

9. Vickers,H., M.J.Kosch, E.Sutton, L.Bjoland, Y.Ogawa, C.La Hoz
A solar cycle of upper thermosphere density observations from the EISCAT Svalbard Radar.
Journal of Geophysical Research: Space Physics, 119, 6833-6845, 2014.

10. Kero,A., J.Vierinen, D.McKay-Bukowski, C.-F.Enell, M.Sinor, L.Roininen, Y.Ogawa
Ionospheric electron density profiles inverted from a spectral riometer measurement.
Geophysical Research Letters, 41, 5370-5375, 2014.

11. Kosch,M.J., H.Vickers, Y.Ogawa, A.Senior, N.Blagoveshchenskaya
First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT.
Geophysical Research Letters,41, 7427-7435, 2014.

12. Kosch,M.J., C.Bryers, M.T.Rietveld, T.K.Yeoman, Y.Ogawa
Aspect angle sensitivity of pump-induced optical emissions at EISCAT.
Earth, Planets and Space, 66, 159, 2014

2013

14 papers were published in 2013.

Refereed Journal Articles

1. Oyama,S., T.Watanabe, R.Fujii, S.Nozawa, T.T.Tsuda
Layered conductance in the ionosphere estimated using data from a multi-wavelength photometer at the European Incoherent Scatter (EISCAT) radar site.
Antarctic Record, 57(3), 339-356, 2013.

2. Ogawa,Y., M.Sawatsubashi, S.C.Buchert, K.Hosokawa, S.Taguchi, S.Nozawa, S.Oyama, T.T.Tsuda, R.Fujii
Relationship between auroral substorm and ion upflow in the nightside polar ionosphere.
Journal of Geophysical Research: Space Physics, 118, 7426-7437, 2013.

3. Tanaka,Y., A.Shinbori, T.Hori, Y.Koyama, S.Abe, N.Umemura, Y.Sato, M.Yagi, S.UeNo, A.Yatagai, Y.Ogawa, Y.Miyoshi
Analysis software for upper atmospheric data developed by the IUGONET project and its application to polar science.
Advances in Polar Science, 24, 231-240, 2013.

4. Yoshikawa,A., O.Amm, H.Vanhamaki, R.Fujii
Theory of Cowling channel formation by reflection of shear Alfven waves from the auroral ionosphere.
Journal of Geophysical Research: Space Physics, 118, 6416-6425, 2013.

5. Yoshikawa,A., O.Amm, H.Vanhamaki, R.Fujii
Illustration of Cowling Channel Coupling to the Shear Alfven Wave.
Journal of Geophysical Research: Space Physics, 118, 6405-6415, 2013.

6. Tsuda,T.T., S.Nozawa, T.D.Kawahara, T.Kawabata, N.Saito, S.Wada, Y.Ogawa, S.Oyama, C.M.Hall, M.Tsutsumi, M.K.Ejiri, S.Suzuki, T.Takahashi, T.Nakamura
Decrease in sodium density observed during auroral particle precipitation over Tromso, Norway.
Geophysical Research Letters, 40, 4486-4490, 2013.

7. Matuura,N., T.Tsuda, S.Nozawa
Field-aligned current loop model on formation of sporadic metal layers.
Journal of Geophysical Research: Space Physics, 118, 4628-4639, 2013.

8. Sakai,J., S.Taguchi, K.Hosokawa, Y.Ogawa
Steep plasma depletion in dayside polar cap during a CME-driven magnetic storm.
Journal of Geophysical Research: Space Physics, 118, 462-471, 2013.

9. Hosokawa,K., S.Taguchi, Y.Ogawa, J.Sakai
Two-dimensional direct imaging of structuring of polar cap patches.
Journal of Geophysical Research: Space Physics, 118, 6536-6543, 2013.

10. Hosokawa,K., S.Taguchi, Y.Ogawa, T.Aoki
Periodicities of polar cap patches.
Journal of Geophysical Research: Space Physics, 118, 447-453, 2013.

11. Ogawa,Y., A.Kadokura, T.Motoba, Y.Tanaka, K.Hosokawa
Processing and visualization of large amounts of auroral data obtained with All-sky/Narrow field-of-view parallel imagers in Tromso and Longyearbyen.
Journal of Space Science Informatics Japan, vol.2, 51-61, 2013. (written in Japanese)
小川 泰信, 門倉 昭, 元場 哲郞, 田中 良昌, 細川 敬祐
トロムソ/ロングイアビンにおけるオーロラ観測用並列イメージャーの大量データ処理と可視化.
宇宙科学情報解析論文誌, vol.2, 51-61, 2013.

12. Tanaka,Y., A.Shinbori, N.Umemura, T.Hori, S.Abe, Y.Koyama, H.Hayashi, S.Ueno, Y.Sato, A.Yatagai, Y.Ogawa, Y.Miyoshi, K.Seki, Y.Miyashita, T.Segawa
Current status and future development of IUGONET data analysis software.
Journal of Space Science Informatics Japan, vol.2, 63-70, 2013. (written in Japanese)
田中 良昌, 新堀 淳樹, 梅村 宜生, 堀 智昭, 阿部 修司, 小山 幸伸, 林 寛生, 上野 悟, 佐藤 由佳, 谷田貝 亜紀代, 小川 泰信, 三好 由純, 関 華奈子, 宮下 幸長, 瀨川 朋紀
IUGONET 解析ソフトウェアの現状と今後の発展.
宇宙科学情報解析論文誌, vol.2, 63-70, 2013.

13. Amm,O., R.Fujii, H.Vanhamaki, A.Yoshikawa, A.Ieda
General solution for calculating polarization electric fields in the auroral ionosphere and application examples.
Journal of Geophysical Research: Space Physics, 118, 2428-2437, 2013.

14. Vickers,H., M.J.Kosch, E.Sutton, Y.Ogawa, C.La Hoz
Thermospheric atomic oxygen density estimates using the EISCAT Svalbard Radar.
Journal of Geophysical Research: Space Physics, 118, 1319-1330, 2013.

2012

11 papers were published in 2012.

Refereed Journal Articles

1. Nozawa,S., C.M.Hall, M.Tsutsumi, A.Brekke, Y.Ogawa, T.T.Tsuda, S.Oyama, R.Fujii
Mean winds, tides, and quasi-2 day waves above Bear Island.
Journal of Atmospheric and Solar-Terrestrial Physics, 90-91, 26-44, 2012.

2. Sato,Y., T.Ono, N.Sato, Y.Ogawa
First observations of 4fce auroral roar emissions.
Geophysical Research Letters, 39, 2012.

3. Fujiwara,H., S.Nozawa, S.Maeda, Y.Ogawa, Y.Miyoshi, H.Jin, H.Shinagawa, K.Terada
Polar cap thermosphere and ionosphere during the solar minimum period: EISCAT Svalbard radar observations and GCM simulations.
Earth, Planets and Space, 64, 459-465, 2012.

4. Taguchi,S., K.Hosokawa, Y.Ogawa, T.Aoki, M.Taguchi
Double bursts inside a poleward-moving auroral form in the cusp.
Journal of Geophysical Research: Space Physics, 117, 2012.

5. Fujii,R., O.Amm, H.Vanhamaki, A.Yoshikawa, A.Ieda
An application of the finite length Cowling channel model to auroral arcs with longitudinal variations.
Journal of Geophysical Research: Space Physics, 117, 2012.

6. Oyama,S., J.Kurihara, B.J.Watkins, T.T.Tsuda, T.Takahashi
Temporal variations of the ion-neutral collision frequency from EISCAT observations in the polar lower ionosphere during periods of geomagnetic disturbances.
Journal of Geophysical Research: Space Physics, 117, 2012.

7. Ogawa,Y., S.Nozawa, I.Haggstrom, S.Oyama, T.Motoba, T.Tsuda, A.Saito, Y.Miyashita, Y.Tanaka, T.Hori, G.Ueno, H.Miyaoka, R.Fujii
Large-scale data processing and visualization of the European incoherent scatter (EISCAT) radar system.
Journal of Space Science Informatics Japan, vol.1, 83-89, 2012. (written in Japanese)
小川泰信, 野澤悟徳, I.Haggstrom, 大山伸一郎, 元場哲郎, 津田卓雄, 齋藤昭則, 宮下幸長, 田中良昌, 堀智昭, 上野玄太, 宮岡宏, 藤井良一
欧州非干渉散乱（EISCAT）レーダーの大規模データ処理と可視化.
宇宙科学情報解析論文誌, vol.1, 83-89, 2012.

8. Tanaka,Y., A.Shinbori, M.Kagitani, T.Hori, S.Abe, Y.Koyama, H.Hayashi,
D.Yoshida, T.Kono, S.Ueno, N.Kaneda, M.Yoneda, H.Tadokoro, T.Motoba,
Y.Miyoshi, K.Seki, Y.Miyashita, T.Segawa, Y.Ogawa
Development of IUGONET data analysis software.
Journal of Space Science Informatics Japan, vol.1, 91-98, 2012. (written in Japanese)
田中良昌, 新堀淳樹, 鍵谷将人, 堀智昭, 阿部修司, 小山幸伸, 林寛生,
吉田大紀, 河野貴久, 上野悟, 金田直樹, 米田瑞生, 田所裕康, 元場哲郎,
三好由純, 関華奈子, 宮下幸長, 瀨川朋紀, 小川泰信
IUGONET解析ソフトウェアの開発.
宇宙科学情報解析論文誌, vol.1, 91-98, 2012.

9. Vanhamaki,H., A.Yoshikawa, O.Amm, R.Fujii
Ionospheric Joule heating and Poynting flux in quasi-static approximation.
Journal of Geophysical Research: Space Physics, 117, 2012.

10. Gorin,J.D., A.V.Koustov, R.A.Makarevich, J.-P.St.-Maurice, S.Nozawa
Velocity of E-region HF echoes under strongly-driven electrojet conditions.
Annales Geophysicae, 30, 235-250, 2012.

11. Lund,E.J., M.R.Lessard, F.Sigernes, D.A.Lorentzen, K.Oksavik, P.M.Kintner, K.A.Lynch, D.H.Huang, B.C.Zhang, H.G.Yang, Y.Ogawa
Electron temperature in the cusp as measured with the SCIFER-2 sounding rocket.
Journal of Geophysical Research: Space Physics, 117, 2012.

2011

11 papers were published in 2011.

Refereed Journal Articles

1. Oyama,S., A.Brekke, T.T.Tsuda, J.Kurihara, B.J.Watkins
Variance of the vertical ion speed measured with the EISCAT UHF radar in the polar lower ionosphere at Tromso, Norway.
Journal of Geophysical Research: Space Physics, 116, 2011.

2. Oyama,S., B.J.Watkins
Generation of atmospheric gravity waves in the polar thermosphere in response to auroral activity.
Space Science Reviews, 168, 463–473, 2011.

3. Kitamura,N., Y.Ogawa, T.Nishimura, N.Terada, T.Ono, A.Shinbori, A.Kumamoto, V.Truhlik, J.Smilauer
Solar zenith angle dependence of plasma density and temperature in the polar cap ionosphere and low-altitude magnetosphere during geomagnetically quiet periods at solar maximum.
Journal of Geophysical Research: Space Physics, 116, 2011.

4. Ogawa,Y., S.C.Buchert, I.Haggstrom, M.T.Rietveld, R.Fujii, S.Nozawa, H.Miyaoka
On the statistical relation between ion upflow and naturally enhanced ion-acoustic lines observed with the EISCAT Svalbard radar.
Journal of Geophysical Research: Space Physics, 116, 2011.

5. Fujii,R., O.Amm, A.Yoshikawa, A.Ieda, H.Vanhamaki
Reformulation and energy flow of the Cowling channel.
Journal of Geophysical Research: Space Physics, 116, 2011.

6. Tanaka,Y.-M., T.Aso, B.Gustavsson, K.Tanabe, Y.Ogawa, A.Kadokura, H.Miyaoka, T.Sergienko, U.Brandstrom, I.Sandahl
Feasibility study on Generalized-Aurora Computed Tomography.
Annales Geophysicae, 29, 551-562, 2011.

7. Tsuda,T.T., S.Nozawa, T.D.Kawahara, T.Kawabata, N.Saito, S.Wada, C.M.Hall, S.Oyama, Y.Ogawa, S.Suzuki, T.Ogawa, T.Takahashi, H.Fujiwara, R.Fujii, N.Matuura, A.Brekke
Fine structure of sporadic sodium layer observed with a sodium lidar at Tromso, Norway.
Geophysical Research Letters, 38, 2011.

8. Amm,O., R.Fujii, K.Kauristie, A.Yoshikawa, A.Ieda, H.Vanhamaki
A statistical investigation of the Cowling channel efficiency in the auroral zone.
Journal of Geophysical Research: Space Physics, 116, 2011.

9. Kosch,M., I.Yiu, C.Anderson, T.Tsuda, Y.Ogawa, S.Nozawa, A.Aruliah, V.Howells, L.Baddeley, I.McCrea, J.Wild
Meso-scale observations of Joule heating near an auroral arc and ion-neutral collision frequency in the polar cap E-region.
Journal of Geophysical Research: Space Physics, 116, 2011.

10. Kosch,M.J., E.Mjolhus, M.Ashrafi, M.T.Rietveld, T.Yeoman, S.Nozawa
Angular dependence of pump-induced bottomside and topside ionospheric plasma turbulence at EISCAT.
Journal of Geophysical Research: Space Physics, 116, 2011.

11. Partamies,N., L.Juusola, E.Tanskanen, K.Kauristie, J.M.Weygand, Y.Ogawa
Substorms during different storm phases.
Annales Geophysicae, 29, 2031-2043, 2011.

2010

8 papers were published in 2010.

Refereed Journal Articles

1. Oyama,S., K.Shiokawa, J.Kurihara, T.T.Tsuda, S.Nozawa, Y.Ogawa, Y.Otsuka, B.J.Watkins
Lower-thermospheric wind fluctuations measured with an FPI in pulsating aurora at Tromsø, Norway.
Annales Geophysicae, 28, 1847-1857, 2010.

2. Kurihara,J., Y.Ogawa, S.Oyama, S.Nozawa, M.Tsutsumi, C.M.Hall, Y.Tomikawa, R.Fujii
Links between a stratospheric sudden warming and thermal structures and dynamics in the high-latitude mesosphere, lower thermosphere, and ionosphere.
Geophysical Research Letters, 37, 2010.

3. Nozawa,S., Y.Ogawa, S.Oyama, H.Fujiwara, T.Tsuda, A.Brekke, C.M.Hall, Y.Murayama, S.Kawamura, H.Miyaoka, R.Fujii
Tidal waves in the polar lower thermosphere observed using the EISCAT long run data set obtained in September 2005.
Journal of Geophysical Research: Space Physics, 115, 2010.

4. Ogawa,Y., S.C.Buchert, A.Sakurai, S.Nozawa, R.Fujii
Solar activity dependence of ion upflow in the polar ionosphere observed with the EISCAT Tromsø UHF radar.
Journal of Geophysical Research: Space Physics, 115, 2010.

5. Hosokawa,K., Y.Ogawa, A.Kadokura, H.Miyaoka, N.Sato
Modulation of ionospheric conductance and electric field associated with pulsating aurora.
Journal of Geophysical Research: Space Physics, 115, 2010.

6. Hosokawa,K. Y.Ogawa
Pedersen current carried by electrons in auroral D-region.
Geophysical Research Letters,37, 2010.

7. Tanaka,Y., T.Aso, B.Gustavsson, K.Tanabe, A.Kadokura,Y. Ogawa
Reconstruction of auroral precipitating electrons by generalized aurora computed tomography.
Journal of IEICE, vol.J93-A, No.2, 136-145, 2010. (written in Japanese)
田中良昌, 麻生武彦, ビヨルン・グスタフソン, 田邉國士, 門倉昭, 小川泰信
一般化オーロラトモグラフィ法によるオーロラ降下電子の再構成
電子情報通信学会論文誌 A, vol.J93-A, No.2, 136-145, 2010.

8. Kosch,M.J., Y.Ogawa, M.T.Rietveld, S.Nozawa, R.Fujii
An analysis of pump-induced artificial ionospheric ion upwelling at EISCAT.
Journal of Geophysical Research: Space Physics, 115, 2010.

2009

7 papers were published in 2009.

Refereed Journal Articles

1. Ogawa,Y., I.Haggstrom, S.C.Buchert, K.Oksavik, S.Nozawa, M.Hirahara, A.P.van Eyken, T.Aso, R.Fujii
On the source of the polar wind in the polar topside ionosphere: First results from the EISCAT Svalbard radar.
Geophysical Research Letters, 36, 2009.

2. Kurihara,J., S.Oyama, S.Nozawa, T.Tsuda, R.Fujii, Y.Ogawa, H.Miyaoka, N.Iwagami, T.Abe, K.-I. Oyama, M.Kosch, A.L.Aruliah, E.Griffin, K.Kauristie
Temperature enhancements and vertical winds in the lower thermosphere associated with auroral heating during the Dynamics and Energetics of the Lower Thermosphere in Aurora (DELTA) campaign.
Journal of Geophysical Research: Space Physics, 114, 2009.

3. Maeda,S., Y.Ogawa, K.Hosokawa, S.Nozawa, S.Oyama, T.Tsuda, A.Brekke
Ion heating in high-speed flow channel within the duskside cell of the polar-cap ion convection under large IMF-By condition.
Journal of Geophysical Research: Space Physics, 114, 2009.

4. Fujii,R., Y.Iwata, S.Oyama, S.Nozawa, Y. Ogawa
Relations between proton auroras, intense electric field and ionospheric electron density depletion.
Journal of Geophysical Research: Space Physics, 114, 2009.

5. Taguchi,S., S.Suzuki, K.Hosokawa, Y.Ogawa, A.S.Yukimatu, N.Sato, M.R.Collier, T.E.Moore
Moving meso-scale plasma precipitation in the cusp.
Journal of Geophysical Research: Space Physics, 114, 2009.

6. Ogawa,Y., S.C.Buchert, R.Fujii, S.Nozawa, A.P.van Eyken
Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar.
Journal of Geophysical Research: Space Physics, 114, 2009.

7. Tsuda,T.T., S.Nozawa, S.Oyama, T.Motoba, Y.Ogawa, H.Shinagawa, N.Nishitani, K.Hosokawa, N.Sato, M.Lester, R.Fujii
Acceleration mechanism of high-speed neutral wind observed in the polar lower thermosphere.
Journal of Geophysical Research: Space Physics, 114, 2009.

2008

11 papers were published in 2008.

Refereed Journal Articles

1. Ogawa,Y., K.Seki, M.Hirahara, K.Asamura, T.Sakanoi, S.C.Buchert, Y.Ebihara, Y.Obuchi, A.Yamazaki, I.Sandahl, S.Nozawa, R.Fujii
Coordinated EISCAT Svalbard radar and Reimei satellite observations of ion upflows and suprathermal ions.
Journal of Geophysical Research: Space Physics, 113, 2008.

2. Amm,O., R. Fujii
Separation of Cowling channel and local closure currents in the vicinity of a substorm breakup spiral.
Journal of Geophysical Research: Space Physics, 113, 2008.

3. Moen,J., Y.Rinne, H.C.Carlson, K.Oksavik, R.Fujii, H.Opgenoorth
On the relationship between thin Birkeland current arcs and reversed flow channels in the winter cusp/cleft ionosphere.
Journal of Geophysical Research: Space Physics, 113, 2008.

4. Hall,C.M., C.Meek, A.Manson, S.Nozawa
Turbopause determination, climatology and climatic trends, using medium frequency radars at 52°N and 70°N.
Journal of Geophysical Research: Atmospheres, 113, 2008.

5. Lunde,J., S.C.Buchert, Y.Ogawa, M.Hirahara, K.Seki, Y.Ebihara, T.Sakanoi, K.Asamura, M.Okada, T.Raita, I.Haggstrom
Ion-dispersion and rapid electron fluctuations in the cusp: a case study.
Annales Geophysicae, 26, 2485-2502, 2008.

6. Oyama,S., B.J.Watkins, S.Maeda, H.Shinagawa, S.Nozawa, Y.Ogawa, A.Brekke, C.Lathuillere, W.Kofman
Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance.
Annales Geophysicae, 26, 1491-1505, 2008.

7. Amm,O., A.Aruliah, S.C.Buchert, R.Fujii, J.W.Gjerloev, A.Ieda, T.Matsuo, C.Stolle, H.Vanhamaki, A.Yoshikawa
Towards understanding the electrodynamics of the 3-dimensional high-latitude ionosphere: present and future.
Annales Geophysicae, 26, 3913-3932, 2008.

8. Buchert,S.C., T.T.Tsuda, R.Fujii, S.Nozawa
The Pedersen current carried by electrons: a non-linear response of the ionosphere to magnetospheric forcing.
Annales Geophysicae, 26, 2837-2844, 2008.

9. Moen,J., X.C.Qiu, H.C.Carlson, R.Fujii, I.W.McCrea
On the diurnal variability in F2-region plasma density above the EISCAT Svalbard radar.
Annales Geophysicae, 26, 2427-2433, 2008.

10. Aso,T., B.Gustavsson, K.Tanabe, U.Brandstrom, T.Sergienko, I.Sandahl
A proposed Bayesian model on the generalized tomographic inversion of aurora using multi-instrument data.
IRF scientific reports, 292, 105-109, 2008.

Non-Refereed Journal Article

11. Fujii,R.
Cutting edge of solar-terrestrial sciences with EISCAT. （EISCATを用いた最先端科学研究）
月刊地球, Vol.30, No.6, 283-293, 2008. (日本語)

2007

8 papers were published in 2007.

Refereed Journal Articles

1. Tsuda,T.T., S.Nozawa, A.Brekke, Y.Ogawa, T.Motoba, R.Roble, R. Fujii
An ion-drag contribution to the lower thermospheric wind in the summer polar region.
Journal of Geophysical Research: Space Physics, 112, 2007.

2. Frederick-Frost,K.M., K.A.Lynch, P.M.Kintner Jr., E.Klatt, D.Lorentzen, J.Moen, Y.Ogawa, M.Widholm
SERSIO: Svalbard EISCAT Rocket Study of Ion Outflows.
Journal of Geophysical Research: Space Physics, 112, 2007.

3. Lorentzen,D.A., P.M.,Kintner, J.Moen, F.Sigernes, K.Oksavik, Y.Ogawa, J.Holmes
Pulsating dayside aurora in relation to ion upflow events during a northward IMF dominated by a strongly negative IMF BY.
Journal of Geophysical Research: Space Physics, 112, 2007.

4. Yordanova,E., D.Sundkvist, S.Buchert, M.Andre, Y.Ogawa, M.Morooka, O.Margithu, O.Amm, A.N.Fazekerley, H.Reme
Energy Input from the Exterior Cusp into the Ionosphere: Correlated Ground-Based and Satellite Observations.
Geophysical Research Letters, 34, 2007.

5. Fujiwara,H., R.Kataoka, M.Suzuki, S.Maeda, S.Nozawa, K.Hosokawa, H.Fukunishi, N.Sato, M.Lester
Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations.
Annales Geophysicae, 25, 2393-2403, 2007.

6. Lunde,J., B.Gustavsson, U.P.Lovhaug, D.A.Lorentzen, Y. Ogawa
Particle Precipitations during NEIAL events: Simultaneous Ground Based Observations at Svalbard.
Annales Geophysicae, 25, 1323-1336, 2007.

7. Simon,C., J.Lilensten, J.Moen, J.Holmes, Y.Ogawa, K.Oksavik, W.F.Denig
TRANS4: a new coupled electron/proton transport code – comparison to observations above Svalbard using ESR, DMSP and optical measurements.
Annales Geophysicae, 25, 661-673, 2007.

8. Hall,C.M., A.Brekke, A.H.Manson, C.E.Meek, S.Nozawa
Trends in mesospheric turbulence at 70°N.
Atmospheric Science Letters, 8, 80-84, 2007.

2006

11 papers were published in 2006.

Refereed Journal Articles

1. Ogawa,Y., S.C.Buchert, R.Fujii, S.Nozawa, F.Forme
Naturally enhanced ion-acoustic lines at high altitudes.
Annales Geophysicae, 24, 3351-3364, 2006.

2. Amm,O., R.Nakamura, H.U.Frey, Y.Ogawa, M.Kubyshikina, A.Balogh, H.Reme
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail.
Annales Geophysicae, 24, 735-750, 2006.

3. Uspensky,M.V., A.V.Koustov, S.Nozawa
STARE velocity at large flow angles: is it related to the ion acoustic speed?
Annales Geophysicae, 24, 873-885, 2006.

4. Nozawa,S., Y.Ogawa, A.Brekke, T.Tsuda, C.M.Hall, H.Miyaoka, J.Kurihara, T.Abe, R.Fujii
EISCAT observational results during the DELTA campaign.
Earth, Planets and Space, 58, 1183-1191, 2006.

5. Abe,T., J.Kurihara, N.Iwagami, S.Nozawa, Y.Ogawa, R.Fujii, H.Hayakawa, K.-I.Oyama
Dynamics and energetics of the lower thermosphere in aurora (DELTA) -Japanese sounding rocket campaign.
Earth, Planets and Space, 58, 1165-1171, 2006.

6. Kurihara,J., T.Abe, K.-I.Oyama, E.Griffin, M.Kosch, A.Aruliah, K.Kauristie, Y.Ogawa, S.Komada, N.Iwagami
Observations of the lower thermospheric neutral temperature and density in the DELTA campaign.
Earth, Planets and Space, 58, 1123-1130, 2006.

7. Griffin,E., M.Kosch, A.Aruliah, A.Kavanagh, I.McWhirter, A.Senior, E.Ford, C.Davis, T.Abe, J.Kurihara, K.Kauristie, Y.Ogawa
Combined ground-based optical support for the aurora (DELTA) sounding rocket campaign.
Earth, Planets and Space, 58, 1113-1121, 2006.

8. Shinagawa,H., S.Oyama
A two-dimensional simulation of thermospheric vertical winds in the vicinity of an auroral arc.
Earth Planets and Space, 58, 1173-1181, 2006.

9. Hall,C.M., T.Aso, M.Tsutsumi, S.Nozawa, C.E.Meek, A.H.Manson
Comparison of meteor and medium frequency radar kilometer scale MLT dynamics at 70°N.
Journal of Atmospheric and Solar-Terrestrial Physics, 68, 309-316, 2006.

10. Gustavsson,B., T.B.Leyser, M.Kosch, M.T.Rietveld, A.Steen, B.U.E.Brandstrom, T.Aso
Electron gyroharmonic effects in ionization and electron acceleration during high-frequency pumping in the ionosphere.
Physical Review Letters, 97, 195002, 2006.

Non-Refereed Journal Article

11. Buchert,S., Y.Ogawa, E.Yordanova, J.-E.Wahlund
Incoherent scatter radar observations of the cusp ionosphere.
Proceeding of the First Swarm International Science Meeting, Nantes, France, May 3-5, 2006.

2005

10 papers were published in 2005.

Refereed Journal Articles

1. Oyama,S., B.J.Watkins, S.Nozawa, S.Maeda, M.Conde
Vertical ion motion observed with incoherent-scatter radars in the polar lower ionosphere.
Journal of Geophysical Research: Space Physics, 110, 2005.

2. Oyama,S., B.J.Watkins, S.Maeda, J. Watermann
Application of a new beam configuration to estimate lower thermospheric vertical velocities at high latitudes with mono-static incoherent scatter radars.
Radio Science, 40, 2005.

3. Maeda,S., S.Nozawa, Y.Ogawa, H.Fujiwara
Comparative study of the high-latitude E-region ion and neutral temperatures in the polar cap and the auroral region derived from the EISCAT radar observations.
Journal of Geophysical Research: Space Physics, 110, 2005.

4. Nozawa,S., A.Brekke, S.Maeda, T.Aso, C.M.Hall, Y.Ogawa, S.C.Buchert, J.Rottger, A.D.Richmond, R.Roble, R.Fujii
Mean winds, tides, and quasi-2 day wave in the polar lower thermosphere observed in European Incoherent Scatter (EISCAT) 8 day run data in November 2003.
Journal of Geophysical Research: Space Physics, 110, 2005.

5. Yuan,Z., R.Fujii, S.Nozawa, Y.Ogawa
Statistical height-dependent relative importance of the Lorentz force and Joule heating in generating atmospheric gravity waves in the auroral electrojets.
Journal of Geophysical Research: Space Physics, 110, 2005.

6. Hall,C.M., T.Aso, M.Tsutsumi, S.Nozawa, A.H.Manson, C.E.Meek
A comparison of mesosphere and lower thermosphere neutral winds as determined by meteor and medium-frequency radar at 70°N.
Radio Science, 40, 2005.

7. Hall,C.M., T.Aso, M.Tsutsumi, S.Nozawa, A.H.Manson, C.E.Meek
Testing the hypothesis of neutral turbulence on the deduction of ambipolar diffusivities from meteor trail expansion.
Annales Geophysicae, 23, 1071–1073, 2005.

8. Gustavsson,B., T.Sergienko, M.J.Kosch, M.T.Rietveld, B.U.E.Brandstrom, T.B.Leyser, B.Isham, P.Gallop, T.Aso, M.Ejiri, T.Grydeland, A.Steen, C.LaHoz, K.Kaila, J.Jussila, H.Holma
The electron energy distribution during HF pumping, a picture painted with all colors.
Annales Geophysicae, 23, 1747-1754, 2005.

9. Nilsson,H., T.I.Sergienko, Y.Ebihara, M.Yamauchi
Quiet time mid-latitude trough: influence of convection, field-aligned currents and proton precipitation.
Annales Geophysicae, 23, 3277-3288, 2005.

Non-Refereed Journal Article

10. Amm,O., R.Nakamura, H.U.Frey, Y.Ogawa, M.Kubyshkina, A.Balogh, H.Reme
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail.
Proceeding of Cluster and Double Star Symposium, ESA SP-598, Noordwijk, The Netherlands, 19-23 September, 2005.

2004

9 papers were published in 2004.

Refereed Journal Articles

1. Oyama,S., C.Lathuillere, S.Maeda, B.J.Watkins
Summer-winter dependences of day-night differences in the ion temperature in the polar upper F region.
Geophysical Research Letters, 31, 2004.

2. Fujiwara,H., S.Maeda, M.Suzuki, S.Nozawa, H.Fukunishi
Estimates of electromagnetic and turbulent energy dissipation rates under the existence of strong wind shears in the polar lower thermosphere from the EISCAT Svalbard radar observations.
Journal of Geophysical Research: Space Physics, 109, 2004.

3. Manson,A.H., C.E.Meek, C.M.Hall, S.Nozawa, N.J.itchell, D.Pancheva, W.Singer, P. Hoffmann
Mesopause dynamics from the scandinavian triangle of radars within the PSMOS-DATAR Project.
Annales Geophysicae, 22, 367-386, 2004.

4. Ogawa,T., S.Nozawa, M.Tsutsumi, N.F.Arnold, N.Nishitani, N.Sato, A.S.Yukimatu
Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: Analysis using simultaneous MF and VHF radar data.
Annales Geophysicae, 22, 4049-4059, 2004.

5. Kojima,M., A.R.Breen, K.Fujiki, K.Hayashi, T.Ohmi, M.Tokumaru
Fast solar wind after the rapid acceleration.
Journal of Geophysical Research: Space Physics, 109, 2004.

6. Buchert,S.C., Y.Ogawa, R.Fujii, A.P.van Eyken
Observations of diverging field-aligned ion flow with the ESR.
Annales Geophysicae, 22, 889-899, 2004.

7. Koizumi,N., S.Okano, T.Sakanoi, M.Taguchi, T.Aso
Auroral O+ 732/733 nm emission and its relation to ion upflow.
Advances in polar upper atmosphere research, 18, 96-104, 2004.

8. Gustavsson,B., T.Sergienko, I.Hagstrom, F.Honary, T.Aso
Simulation of high energy tail of electron distribution function.
Advances in polar upper atmosphere research, 18, 1-9, 2004.

Non-Refereed Journal Article

9. Fujii,R. N.Sato
Upper atmosphere studies viewing from both polar regions, from IGY to IPY-4.
(両極からみたIGYからIPY-4への超高層物理学研究)
学術月報, 57(5), 391-398, 2004.05. (日本語)

2003

11 papers were published in 2003.

Refereed Journal Articles

1. Oyama,S., S.Nozawa, S.Maeda, Y.Murayama, R.Fujii, H.Shinagawa
Field-aligned ion motions in the E-F transition region: Mean characteristics.
Journal of Geophysical Research: Space Physics, 108, 2003.

2. Ogawa,Y., R.Fujii, S.C.Buchert, S.Nozawa, S.Ohtani
Simultaneous EISCAT Svalbard radar and DMSP observations of ion upflow in the dayside ionosphere.
Journal of Geophysical Research: Space Physics, 108, 2003.

3. Nozawa,S., S.Imaida, A.Brekke, C.M.Hall, A.Manson, C.Meek, S.Oyama, K.Dobashi, R.Fujii
The quasi 2-day wave observed in the polar mesosphere.
Journal of Geophysical Research: Atmospheres, 108, D2, ACL3-1 - ACL3-12, 2003.

4. Nozawa,S., H.Iwahashi, A.Brekke, C.Hall, C.Meek, A.Manson, S.Oyama, Y.Murayama, R.Fujii
The quasi 2‐day wave observed in the polar mesosphere: Comparison of the characteristics observed at Tromsø and Poker Flat.
Journal of Geophysical Research: Atmospheres, 108, D24, 2003.

5. Hall,C. M.,T.Aso, A.H.Manson, C.E.Meek, S.Nozawa, M.Tsutsumi
High-latitude mesospheric mean winds: A comparison between Tromsø (69°N) and Svalbard (78°N).
Journal of Geophysical Research: Atmospheres, 108, D19, 2003.

6. Grydeland,T., C.La Hoz, T.Hagfors, E.M.Blixt, S.Saito, A.Stroemme, A.Brekke
Interferometric observations of filamentary structures associated with plasma instability in the auroral ionosphere.
Geophysical Research Letters, 30, 6, 2003.

7. Uspensky,M., A.Koustov, P.Janhunen, R.Pellinen, D.Danskin, S.Nozawa
STARE Velocities: Importance of Off-Orthogonality and Ion Motions.
Annales Geophysicae, 21, 729-743, 2003.

8. Hall,C.M, S.Nozawa, C.E.Meek, A.H.Manson, Yi Luo
Periodicities in energy dissipation rates in the auroral mesosphere/lower thermosphere.
Annales Geophysicae, 21, 787-796, 2003.

9. Shinagawa,H., S.Oyama, S.Nozawa, S.C.Buchert, R.Fujii, M.Ishii
Thermospheric and ionospheric dynamics in the auroral region.
Advances in Space Research, 31, 951-956, 2003.

10. Wu,Q., T.K.Kileen, S.Nozawa, D.McEwen, W.Guo, S.C.Solomon
Observations of mesospheric neutral wind 12-hour wave in the Northern Polar Cap.
Journal of Atmospheric and Solar-Terrestrial Physics,65, 971-978, 2003.

11. Gustavsson,B., B.U.E.Brandstrom, A.Steen, T.Sergienko, T.B.Leyser, M.T.Rietveld, T.Aso, M.Ejiri
Nearly simultaneous images of HF‐pump enhanced airglow at 6300 Å and 5577 Å.
Geophysical Research Letters, 29, 73-1 - 73-4, 2002.

2002

11 papers were published in 2002.

Refereed Journal Articles

1. Fujii,R., S.Oyama, S.C.Buchert, S.Nozawa, N.Matuura
Field-aligned ion motions in the E and F regions.
Journal of Geophysical Research: Space Physics, 107, SIA1-1 - SIA1-13, 2002.

2. Nozawa,S., A.Brekke, A.Manson, C.Hall, C.Meek, K.Morise, S.Oyama, K.Dobashi, R. Fujii
A comparison study of the auroral lower thermospheric neutral winds derived by the EISCAT UHF radar and the Tromsø medium frequency radar.
Journal of Geophysical Research: Space Physics, 107, SIA29-1 - SIA29-20, 2002.

3. Sugino,M., R.Fujii, S.Nozawa
Relative contribution of ionospheric conductivity and electric field to ionospheric current.
Journal of Geophysical Research: Space Physics, 107, SIA20-1 - SIA20-15, 2002.

4. Hosokawa,K., M.Sugino, M.Lester, N.Sato, A.S.Yukimatu, T.Iyemori
Simultaneous measurement of duskside subauroral irregularities from the CUTLASS Finland radar and EISCAT UHF system.
Journal of Geophysical Research: Space Physics, 107, SIA11-1 - 11-14, 2002.

5. Hall,C.M., T.Aso, M.Tsutsumi
An examination of high latitude upper mesosphere dynamic stability using the Nippon / Norway Svalbard Meteor Radar.
Geophysical Research Letters, 29, 121-1 - 121-3, 2002.

6. Maeda,S., S.Nozawa, M.Sugino, H.Fujiwara, M.Suzuki
Ion and neutral temperature distributions in the E-region observed by the EISCAT Tromsø and Svalbard radars.
Annales Geophysicae, 20, 1415-1427, 2002.

7. Danskin,D.W., A.V.Koustov, T.Ogawa, N.Nishitani, S.Nozawa, S.E.Milan, M.Lester, D.Andre
On the factors controlling occurrence of F-region coherent echoes.
Annales Geophysicae, 20, 1385-1397, 2002.

8. Sugino,M., R.Fujii, S.Nozawa, T.Nagatsuma, S.C.Buchert, J.W.Gjerloev, M.J.Kosch
Field-aligned currents and ionospheric parameters deduced from EISCAT radar measurements in the post-midnight sector.
Annales Geophysicae, 20, 1335-1348, 2002.

9. Koustov,A.V., D.W.Danskin, M.V.Uspensky, T.Ogawa, P.Janhunen, N.Nishitani, S.Nozawa, M.Lester, S.Milan
Velocities of auroral coherent echoes at 12 and 144 MHz.
Annales Geophysicae, 20, 1647-1661, 2002.

10. Hall,C.M., S.Nozawa, C.E.Meek, A.H.Manson
On the response of fading times of upper homosphere radar echoes to soloar and geomagnetic disturbances.
Earth, Planets and Space, 54, 699-705, 2002.

Non-Refereed Journal Article

11. Fujii,R.
"Climate & Weather of the Sun-Earth System (CAWSES) Project", Towards a comprehensive understanding of solar-terrestrial physics.
太陽地球系物理のより総合的な理解を求めて
学術の動向, 7, 84-86, 2002. (日本語)

2001

11 papers were published in 2001.

Refereed Journal Articles

1. Forme,F., Y.Ogawa, S.C.Buchert
Naturally enhanced ion acoustic lines seen at different wavelengths.
Journal of Geophysical Research: Space Physics, 106, 21503-21515, 2001.

2. Ogawa,T., S.C.Buchert, N.Nishitani, N.Sato, M.Lester
Plasma density supression process around the cusp revealed by simultaneous CUTLASS and EISCAT Svalbard radar observations.
Journal of Geophysical Research: Space Physics, 106, 5551-5564, 2001.

3. Oyama,S., M.Ishii, Y.Murayama, H.Shinagawa, S.Nozawa, S.C.Buchert, R.Fujii, W.Kofman
Generation of atmospheric gravity waves associated with auroral activity in the polar F-region.
Journal of Geophysical Research: Space Physics, 106, 18543-18554, 2001.

4. Nozawa,S., A.D.Richmond, R.Roble, H.-L.Liu
Comparison of the auroral E region neutral winds derived with the European Incoherent Scatter radar and predicted by the National Center for Atmospheric Research Thermosphere-ionosphere-mesosphere-electrodynamics general circulation model.
Journal of Geophysical Research: Space Physics, 106, 24691-24700, 2001.

5. Gustavsson,B., T.Sergienko, M.T.Rietveld, F.Honary, A.Steen, B.U.E.Braendstroem, T.B.Leyser, A.Arulia, T.Aso, M.Ejiri, S.Marple
First tomographic estimate of volume distribution of HF-pump enhanced airglow emission.
Journal of Geophysical Research: Space Physics, 106, 29105-29123, 2001.

6. Aso,T.
A study on the Arctic upper-atmospheric tide by EISCAT radar -Recent results and prospects.
Memoirs of National Institute of Polar Research. Special issue, 54, 43-48, 2001.

7. Saito,S., S.C.Buchert, S.Nozawa, R.Fujii
Observation of isotropic electron temperature in the turbulent E region.
Annales Geophysicae, 19, 11-15, 2001.

8. Balan,N., R.Fujii
Changes in the ionosphere over EISCAT during ion frictional heating events.
Advances in Space Research, 27, 8, 1413-1416, 2001.

9. Nagatsuma,T., S.Nozawa, S.C.Buchert, R. Fujii
Higher latitude Pi3 pulsations observed by the EISCAT VHF radar.
Advances in Space Research, 27, 8, 1429-1431, 2001.

10. Oyama,S., H.Shinagawa, S.C.Buchert, R.Fujii, S.Nozawa, M.Ishii, Y.Murayama, W.Kofman
Effects of auroral arcs on the generation of gravity waves in the auroral F-region.
Advances in Space Research, 27, 10, 1767-1772, 2001.

Non-Refereed Journal Article

11. Fujii,R.
Current status of auroral studies in the northern polar region.
北極域のオーロラ研究の現状 (特集:最近の極域研究)
学術月報, 54(2), 132-136, 2001. （日本語）

2000

21 papers were published in 2000.

Refereed Journal Articles

1. Oyama,S., S.Nozawa, S.C.Buchert, M.Ishii, S.Watari, E.Sagawa, W.Kofman, J.Lilensten, R.Fujii
Effects of atmospheric oscillations on the field-aligned ion motions in the polar F-region.
Annales Geophysicae, 18, 1154-1163, 2000.

2. Ogawa,Y., R.Fujii, S.C.Buchert, S.Nozawa, S.Watanabe, A.P.van Eyken
Simultaneous EISCAT Svalbard and VHF radar observations of ion upflows at different aspect angles.
Geophysical Research Letters, 27, 81-84, 2000.

3. van Eyken,A.P., P.J.S.Williams, S.C.Buchert, M.Kunitake
First measurements of tidal modes in the lower thermosphere by the EISCAT Svalbard Radar.
Geophysical Research Letters,27, 931-934, 2000.

4. Kikuchi,T., H.Luhr, K.Schlegel, H.Tachihara, M.Shinohara, T.-I.Kitamura
Penetration of auroral electric fields to the equator during a substorm.
Journal of Geophysical Research: Space Physics, 105, 23251-23261, 2000.

5. Nozawa,S. A.Brekke
A case study of the auroral E region neutral wind on a quiet summer day: Comparison of the EISCAT UHF radar for deriving the E region wind.
Radio Science, 35, 845-863, 2000.

6. Ogawa,Y., F.Forme, S.C.Buchert
Frequency dependent power fluctuations: a feature of the ESR system or physical?
Annales Geophysicae, 18, 1224-1230, 2000.

7. Endo,M., R.Fujii, Y.Ogawa, S.C.Buchert, S.Nozawa, S.Watanabe, N.Yoshida
Ion upflow and downflow at the topside ionosphere observed by the EISCAT VHF radar.
Annales Geophysicae, 18, 170-181, 2000.

8. Saito,S., S.C.Buchert, S.Nozawa, R. Fujii
Effects of a kappa distribution function of electrons on incoherent scatter spectra.
Annales Geophysicae, 18, 1216-1223, 2000.

9. Yoshida,N., S.Watanabe, H.Fukunishi, T.Sakanoi, T.Abe, T.Mukai, H.Hayakawa, A.Matsuoka, Y.Kasahara, R.Fujii, S.Nozawa, Y.Ogawa
Coordinated Akebono and EISCAT Observations of Suprathermal Ion Outflows in the Nightside Inverted-V Region.
Journal of Atmospheric and Solar-Terrestrial Physics, 62, 6, 449-465. 2000.

10. Shibata,T., H.Matsuya, J. Hoashi
Ion composition in the auroral lower F-region inferred from residuals of ion temperature profiles observed with EISCAT.
Advances in Space Research, 25, 1, 201-210, 2000.

11. Fujii,R., S.Nozawa, S.C.Buchert, A. Brekke
Energy coupling between the magnetosphere, ionosphere and thermosphere.
Advances in Space Research, 25, 1, 213-218, 2000.

12. Kosch,M.J., M.Ishii, S.Nozawa, D.Rees, K.Cierpka, A.Kohsiek, K.Schlegel, R.Fujii, T.Hagfors, T.J.Fuller-Rowell, C.Lathuillere
A comparison of thermospheric winds and temperatures from Fabry-Perot interferometer and EISCAT radar measurements with models.
Advances in Space Research, 26, 6, 979-984, 2000.

13. Aso,T, A.Steen, U.Brandstrom, B.Gustavsson, A.Urashima, M.Ejiri
ALIS, a state-of-the-art optical observation network for the exploration of polar atmospheric processes.
Advances in Space Research, 26, 6, 917-924, 2000.

14. Cierpka,K., M.J.Kosch, S.Nozawa, K.Schlegel, A.Kohsiek, T.Hagfors
Combined EISCAT and Fabry-Perot Interferometer Measurements of Ionospheric-Thermospheric coupling.
Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science, 25, 5-6, 563-566, 2000.

15. Maeda,S., S.Nozawa
Meridional Gradients of the Neutral Temperature in the Dayside Summer E-Region.
Advances in polar upper atmosphere research, 14, 128-137, 2000.

16. Aso,T.
Penetration of the non-migrating atmospheric diurnal tide into polar latitudes.
Advances in polar upper atmosphere research, 14, 138-145, 2000.

17. Hedin,M., I.Haggstrom, A.Pellinen-Wannberg, L.Andersson, U.Brandstrom, B.Gustavsson, A.Steen, A.Westman, G.Wannberg, T.van Eyken, T.Aso, C.Cattell, C.W.Carlosn, D.Klumpar
3-D extent of the main ionospheric trough -a case study.
Advances in polar upper atmosphere research, 14, 157-162, 2000.

18. Haggstrom,I., M.Hedin, T.Aso, A.Westman, A.Pellinen-Wannberg, A.Westman
Auroral field-aligned currents by incoherent scatter plasma line observations in the E region.
Advances in polar upper atmosphere research, 14, 103-121, 2000.

19. Leyser,T.B., B.Gustavsson, B.U.E.Brandstrom, A.Steen, F.Honary, M.T.Rietveld, T.Aso, M.Ejiri
Simultaneous measurements of high-frequency pump-enhanced airglow and ionospheric temperatures at auroral latitudes.
Advances in polar upper atmosphere research, 14, 1-11, 2000.

20. Hall,C.M., T. Aso
Identification of possible ion-drag induced neutral instability in the lower thermosphere over Svalbard.
Earth, Planets and Space, 52, 639-643, 2000.

Non-Refereed Journal Article

21. Gjerloev,J.W., R.Fujii, M.Sugino, Y.Ogawa
The Ørsted-EISCAT Conjunction Study.
Conference Paper, in Proceedings of the Ørsted 3rd International Science Team Meeting, Grasse, France, May 2-4, 2000.

1999

11 papers were published in 1999.

Refereed Journal Articles

1. Nozawa,S., A.Brekke
Studies of the auroral E-region neutral wind through a solar cycle: Quiet days.
Journal of Geophysical Research: Space Physics, 104, 45-66, 1999.

2. Fujii,R., S.Nozawa, S.C.Buchert, A.Brekke
Statistical characteristics of electromagnetic energy transfer between the magnetosphere, the ionosphere and the thermosphere.
Journal of Geophysical Research: Space Physics, 104, 2357-2365, 1999.

3. Maeda,S., H.Fujiwara, S.Nozawa
Momentum balance of dayside E region neutral winds during geomagnetically quiet summer days.
Journal of Geophysical Research: Space Physics, 104, 19871-19879, 1999.

4. Buchert,S.C., Fujii,R., K.-H.,Glassmeier
Ionospheric conductivity modulation in ULF pulsations.
Journal of Geophysical Research: Space Physics, 104, 10119-10133, 1999.

5. Hall,C., T.Aso
Mesospheric velocities and buoyancy subrange spectral slopes determined over Svalbard by ESR.
Geophysical Research Letters, 26, 1685-1688, 1999.

6. Brandstrom,B.U.E., T.B.Leyser, A.Steen, M.T.Rietveld, B.Gustavsson, T.Aso, M. Ejiri
Unambiguous evidence of HF pump-enhanced airglow at auroral latitudes.
Geophysical Research Letters,26, 3561-3564, 1999.

7. Nozawa,S., A.Brekke
Seasonal variation of the auroral E-region neutral wind for different solar activities.
Journal of Atmospheric and Solar-Terrestrial Physics, 61, 8, 585-605, 1999.

8. Ishii,M., S.Oyama, S.Nozawa, R.Fujii, E.Sagawa, S.Watari, H.Shinagawa
Dynamics of Neutral Wind in the polar region observed with two Fabry-Perot Interferometers.
Earth, Planets and Space, 51, 833-844, 1999.

9. Buchert,S.C., A.P.van Eyken, T.Ogawa, S.Watanabe
Naturally enhanced ion-acoustic lines seen with the EISCAT Svalbard Radar.
Advances in Space Research, 23, 10, 1699-1704, 1999.

10. Ejiri,M., T.Aso, M.Okada, M.Tsutsumi, M.Taguchi, N.Sato, S.Okano
Japanese research project on arctic and antarctic observations of the middle atmosphere.
Advances in Space Research, 24, 12, 1689-1692, 1999.

11. Aso,T., A.van Eyken, P.J.S.Williams
EISCAT Svalbard radar-derived atmospheric tidal features in the lower thermosphere as compared with the numerical modeling ATM2.
Advances in Polar Upper Atmosphere Research, 13, 48-56, 1999.

1998

7 papers were published in 1998.

Refereed Journal Articles

1. Fujii,R., S.Nozawa, S.C.Buchert, N.Matuura, A.Brekke,
Study on neutral wind contribution to the electrodynamics in the polar ionosphere using EISCAT CP-1 data.
Journal of Geophysical Research: Space Physics, 103, 14731-14739, 1998.

2. Fujii,R., S.Nozawa, S.C.Buchert, N.Matuura, A.Brekke
The motion of ions in the auroral ionosphere.
Journal of Geophysical Research: Space Physics, 103, 20685-20695, 1998.

3. Lühr,H., M.Rother, T.Iyemori, T.L.Hansen, R.P.Lepping
Superposed epoch analysis applied to large-amplitude travelling convection vortices.
Annales Geophysicae, 16, 743-753, 1998.

4. Shibata,T., R.Fujii, K.Schlegel
Vertical attenuation rate of atmospheric gravity waves in the lower-F region observed with the EISCAT radar. (extended abstract)
Proceedings of the NIPR Symposium on Upper Atmosphere Physics, 12, 131-137, 1998.
(This is an extended abstract paper, but reviewed by referees)

5. Maeda,S., H.Fujiwara, S.Nozawa
Dayside neutral winds in the quiet E-region deduced from the EISCAT radar data.(extended abstract)
Proceedings of the NIPR Symposium on Upper Atmosphere Physics, 12, 138-143, 1998.
(This is an extended abstract paper, but reviewed by referees)

6. Nishino,M., S.Nozawa, J.A.Holtet
Daytime ionospheric absorption features in the polar cap associated with poleward drifting F-region plasma patches.
Earth, Planets and Space, 50, 107-117, 1998.

Non-Refereed Journal Article

7. Fujii,R.
Study of polar upper atmosphere using radars in the northern polar region.
MIA, 58, 9-12, 1998.（日本語）

1997

2 papers were published in 1997.

Refereed Journal Articles

1. Araki,T., S.Fujitani, M.Emoto, K.Yumoto, K.Shiokawa, T.Ichinose, H.Luhr, D.Orr, D.K.Milling, H.Singer, G.Rostoker, S.Tsunomura, Y.Yamada, C.F.Liu
Anomalous sudden commencement on March 24, 1991.
Journal of Geophysical Research: Space Physics, 102, 14075-14086, 1997.

2. Nozawa,S., A.Brekke, R.Fujii
Studies of the E-region neutral wind in the auroral ionosphere using two long-run data.
Journal of geomagnetism and geoelectricity, 49, 641-673, 1997.

1996

2 papers were published in 1996.

Refereed Journal Articles

1. Kikuchi,T., H.Luhr, T.Kitamura, O.Saka, K.Schlegel
Direct penetration of the polar electric field to the equator during a DP 2 event as detected by the auroral and equatorial magnetometer chains and the EISCAT radar.
Journal of Geophysical Research: Space Physics, 101, 17161-17173, 1996.

2. Brekke,A., Y.Kamide
On the relationship between Joule and frictional heating in the polar ionosphere.
Journal of Atmospheric and Terrestrial Physics, 58, 139-143, 1996.

1995

7 papers were published in 1995.

Refereed Journal Articles

1. Nozawa,S., A. Brekke
Studies of the E region neutral wind in the disturbed auroral ionosphere.
Journal of Geophysical Research: Space Physics, 100, 14717-14734, 1995.

2. Sato,M., Y.Kamide, A.D.Richmond, A.Brekke, S.Nozawa
Regional estimation of electric fields and currents in the polar ionosphere.
Geophysical Research Letters, 22, 283-286, 1995.

3. Brekke,A., S.Nozawa, M. Sato
Samples of auroral E-region parameters derived from EISCAT experiments.
Journal of geomagnetism and geoelectricity, 47, 889-909, 1995.

4. Fujii,R., S.Nozawa, M.Sato, N.Matuura, T.Ono, A.Brekke, C.Hall, T.-L. Hansen
Comparison of electron spectra calculated from EISCAT electron density profiles with those observed by DMSP satellites.
Journal of geomagnetism and geoelectricity, 47, 771-782, 1995.

5. Matuura,N., R.Fujii, Y.Kamide, S.Kokubun, T.Oguti
Japan-EISCAT colaboration on the Svalbard radar: Scientific significance.
Journal of geomagnetism and geoelectricity, 47, 681-684, 1995.

6. Matuura,N
Mechanisms on the solar wind-magnetosphere interactions: Importance of the Svalbard radar.
Journal of geomagnetism and geoelectricity, 47, 721-733, 1995.

その他

7. (Editors:) Matuura,N., Y.Kamide
Structure and Dynamics of the Polar Ionosphere.
Proc. Japan-EISCAT Symposium on the Polar Ionosphere, June 1995.

1994

1 papers were published in 1994.

Refereed Journal Articles

1. Brekke,A., S.Nozawa, T.Sparr
Studies of the E region neutral wind in the quiet auroral ionosphere.
Journal of Geophysical Research: Space Physics, 99, 8801-8825, 1994.

1991

3 papers were published in 1991.

Refereed Journal Articles

1. N.Matuura, T.Oguti
Japanese Plans for Spitsbergen Radar.
Annales Geophysicae, 9, 339-339, 1991.

Non-Refereed Journal Articles

2. N.Matuura, T.Oguti, S.Nozawa
Spitsbergen IS Radar Plan.
Proc. 90th Assembly of the Society of Geomagnetism and Earth, Planetary and Space Sciences, A31-11, 1991. (in Japanese)

3. N.Matuura, S.Nozawa
Spitsbergen Radar Plan.
Proc. 2nd Symposium on Inosphere-Magnetosphere and Over-Sea Observations, 153-161, 1991. (in Japanese)