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, EPSP-D-22-00079, 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, angeo-2022-5, 2022,

3. Nanjo, S., S. Nozawa, M. Yamamoto, T. Kawabata, M. G. Johnsen, T. T. Tsuda, and K. Hosokawa,
An Automated Auroral Detection System Using Deep Learning: Real-time Operation in Tromsoe, Norway,
Scientific Reports, DOI: 10.1038/s41598-022-11686-8, 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, doi:10.1029/2021JA030072, 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, and 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, doi:10.1029/2021JA030062, 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, doi:10.1029/2021JA029880, 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, doi:10.1051/swsc/2022014, 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, vol 40, 1-10, 2022.

2021

Refereed Journal Articles

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, EPSP-D-20-00293, 2021.

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, and R. Fujii,
Over-darkening of pulsating aurora,
Journal of Geophysical Research: Space Physics, doi:10.1029/2020JA028838, 2021.

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, doi:10.1029/2020JA028477, 2021.

Takada, M., K. Seki, Y. Ogawa, , K. Keika, S. Kasahara, S. Yokota, T. Hori, K. Asamura, Y. Miyoshi, and 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, doi:10.1029/2020JA028951, 2021.

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, e2021JA029601. doi:10.1029/2021JA029601, 2021.

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, e2021GL094494. doi:10.1029/2021GL094494, 2021.

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, e2021JA029309. doi:10.1029/2021JA029309, 2021.

Miyoshi, Y., Hosokawa, K., Kurita, S. et al.
Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae.
Sci Rep 11, 13724. doi:10.1038/s41598-021-92611-3, 2021.

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, e2021JA029572. doi:10.1029/2021JA029572, 2021.

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, e2020JA028633. doi:10.1029/2020JA028633, 2021.

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, e2020JA028538. doi:10.1029/2020JA028538, 2021.

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, e2020JA028432. doi:10.1029/2020JA028432, 2021.

2020

9 papers are currently published in 2020.

Refereed Journal Articles

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, doi:10.1007/s11214-019-0629-3, 2020.

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

Hosokawa, K., Kullen, A., Milan, S., et al., Aurora in the Polar Cap: A Review, Space Sci Rev 216, 15, https://doi.org/10.1007/s11214-020-0637-3, 2020.

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, and R. Fujii, Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves, Nature Scientific Reports, SREP-19-35427A, 2020.

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, e2020JA028468. doi:10.1029/2020JA028468, 2020.

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, doi:10.1016/j.polar.2019.100501, 2020.

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, e2020JA028250. https://doi.org/10.1029/2020JA028250, 2020.

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, doi:10.1029/2019GL085590, 2020.

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, doi:10.1029/2020JA028432, 2020.

2019

7 papers are published in 2019.

Refereed Journal Articles

Taguchi, S., K. Hosokawa, Y. Ogawa, Plasma flow in the north-south aligned auroral region equatorward of the dayside auroral oval, Journal of Geophysical Research: Space Physics, doi:10.1029/2019JA026895, 2019.

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, J. Geophys. Res.: Space Physics, doi: 10.1029/2018JA026254, 2019.

Ogawa, Y., K. Seki, K. Keika, Y. Ebihara, Characteristics of CME- and CIR-driven ion upflows in the polar ionosphere, J. Geophys. Res., doi: 10.1029/2018JA025636, 2019.

Kozlovsky, A., S. Shalimov, S. Oyama, K. Hosokawa, M. Lester, Y. Ogawa, and 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, doi: 10.1029/2019JA026829, 2019.

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 Space 71, 110, doi:10.1186/s40623-019-1093-8, 2019

Xu, H., K. Shiokawa, S. Oyama, and Y. Otsuka, Thermospheric wind variations observed by a Fabry-Perot interferometer at Tromsø, Norway, at substorm onsets, Earth, Planets and Space, 71:93, https://doi.org/10.1186/s40623-019-1072-0, 2019.

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. https://doi.org/10.1029/2018JA026241, 2019.

2018

5 papers are published in 2018.

Refereed Journal Articles

Nozawa, S., T. Kawabata, K. Hosokawa, Y. Ogawa, T. T. Tsuda, A. Mizuno, R. Fujii, and C. M. Hall,
A new five-wavelength photometer operated in Tromsø (69.6ºN, 19.2ºE),
Earth Planets Space, 70, 193, doi:10.1186/s40623-018-0962-x, 2018.

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, and T. Leyser,
Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm,
Earth Planets Space, 70, 166, doi:10.1186/s40623-018-0936-z, 2018.

Tsuda, T. T., M. T. Rietveld, M. J. Kosch, S. Oyama, Y. Ogawa, K. Hosokawa, S. Nozawa, T. Kawabata, and A. Mizuno,
Survey of conditions for artificial aurora experiments by the second electron gyro-harmonic at EISCAT Tromsø using dynasonde data,
Earth Planets Space, 70, 94, doi:10.1186/s40623-018-0864-y, 2018.

Tsuda, T. T., M. T. Rietveld, M. J. Kosch, S. Oyama, K. Hosokawa, S. Nozawa, T. Kawabata, A. Mizuno, and Y. Ogawa,
Survey of conditions for artificial aurora experiments at EISCAT Tromsø using dynasonde data,
Earth Planets Space, 70, 40, doi:10.1186/s40623-018-0805-9, 2018.

Virtanen, I. I., B. Gustavsson, A. Aikio, A. Kero, K. Asamura, and Y. Ogawa,
Electron energy spectrum and auroral power estimation from incoherent scatter radar measurements,
J. Geophys. Res. Space Physics, 123, 6865-6887, doi:10.1029/2018JA025636, 2018.

2017

9 papers are published in 2017.

Refereed Journal Articles

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
J. Geophysical Res., doi:10.1002/2017JA024613, 2017

Oyama, S., A. Kero, C. J. Rodger, M. A. Clilverd, Y. Miyoshi, N. Partamies, E. Turunen, T. Raita, P. T. Verronen, and S. Saito,
Energetic electron precipitation and auroral morphology at the substorm recovery phase,
J. Geophys. Res., doi:10.1002/2016JA023484, 2017.

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, and C. Hall,
Depletion of mesospheric sodium during extended period of pulsating aurora,
J. Geophys. Res., DOI: 10.1002/2016JA023472, 2017.

Bjoland, L. M., Y. Ogawa, C. Hall, M. Rietveld, U.P. Lovhaug, C. La Hoz, and H. Miyaoka,
Long-term variations and trends in the polar E-region,
J. Atmos. Solar-Terr. Phys., 2017.

Taguchi, S., Y. Chiba, K. Hosokawa, and Y. Ogawa,
Horizontal profile of a moving red line cusp aurora,
J. Geophys. Res., DOI: 10.1002/2016JA023115, 2017.

Yamazaki, Y., M. J. Kosch, and Y. Ogawa,
Average field-aligned ion velocity over the EISCAT radars,
J. Geophys. Res., DOI: 10.1002/2017JA023974, 2017.

Adachi, K., S. Nozawa, Y. Ogawa, A. Brekke, . M. Hall, and 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, doi:10.1186/s40623-017, 2017.

Sergeeva, V., N. Stepanova, Y. Ogawa, S. Kakic, and K. Kauristie,
Solar wind dependence of electric conductances and currents in the auroral zone,
J. Atmos. Solar-Terr. Phys., dx.doi.org/10.1016/j.jastp.2017.07.006, 2017.

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

2016

7 papers are published in 2016.

Refereed Journal Articles

Oyama, S.-i., K. Shiokawa, Y. Miyoshi, K. Hosokawa, B. J. Watkins, J. Kurihara, T. T. Tsuda, and C. T. Fallen,
Lower thermospheric wind variations in auroral patches during the substorm recovery phase,
J. Geophys. Res. Space Physics, 121, doi:10.1002/2015JA022129, 2016.

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, and F. Tsuchiya,
Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations.
J. Geophys. Res. Space Physics, 120, 2754-2766, doi:10.1002/2014JA020690, 2016.

Tsuda, T., M. Yamamoto, H. Hashiguchi, K. Shiokawa, Y. Ogawa, S. Nozawa, H. Miyaoka and A. Yoshikawa,
A proposal on the study of solar-terrestrial coupling processes with atmospheric radars and ground-based observation network,
Radio Science, 51, doi:10.1002/2016RS006035, 2016.

Yamazaki, Y., M.J. Kosch, Y. Ogawa, abnd D. R. Themens,
High-latitude Ion Temperature Climatology during the International Polar Year 2007-2008,
J. Space Weather Space Clim., 6, A35, doi:10.1051/swsc/2016029, 2016.

Turunen, E., A. Kero, P. T. Verronen, Y. Miyoshi, S.-I. Oyama, and S. Saito,
Mesospheric ozone destruction by high-energy electron precipitation associated with pulsating auora,
J. Geophys. Res., 121, doi;10.1002/2016JD025015, 2016.

Hosokawa, K., S. Taguchi, and Y. Ogawa,
Edge of polar cap patches,
J. Geophys. Res., doi: 10.1002/2015JA021960, 2016.

Hosokawa, K., S. Taguchi, and Y. Ogawa,
Periodic creation of polar cap patches from auroral transients in the cusp,
J. Geophys. Res., doi: 10.1002/20015JA022221, 2016.

2015

8 papers were published in 2015.

Refereed Journal Articles

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, and F. Tsuchiya,
Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations,
J. Geophys. Res. Space Physics, doi:10.1002/2014JA020690, 2015.

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, and N. Nishitani,
Approximate forms of daytime ionospheric conductance,
J. Geophys. Res. Space Physics, 119, pages 10,397-10,415. doi:10.1002/2014JA020665, 2015.

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, and 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,
Ann. Geophys., 33, 941-953, doi:10.5194/angeo-33-941-2015, 2015.

Hosokawa, K. and Y. Ogawa,
Ionospheric variation during pulsating aurora,
J. Geophys. Res., DOI: 10.1002/2015JA021401, 2015.

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, DOI:10.1016/j.jastp.2015.08.012, 2015.

Ishida, T., Y. Ogawa, A. Kadokura, K. Hosokawa, and Y. Otsuka,
Direct observations of blob deformation during a substorm,
Ann. Geophys., 33, 525-530, doi:10.5194/angeo-33-525-2015, 2015.

Taguchi, S., K. Hosokawa and 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, doi:10.1186/s40645-015-0044-7, 2015.

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, and J. Vierninen,
The science case for the EISCAT_3D radar,
Progress in Earth and Planetary Science, doi:10.1186/s40645-015-0051-8, 2015.
- 日本語要約

2014

12 papers were published in 2014.

Refereed Journal Articles

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, and R.Fujii,
A case study of gravity wave dissipation in the polar MLT region using sodium LIDAR and radar data,
Ann. Geophys., 32, 1195-1205, 2014.

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,
J. Geophys. Res., 119, doi:10.1029/2014JA020050, 2014.

Fujiwara, H., S. Nozawa, Y. Ogawa, R. Kataoka, Y. Miyoshi, H. Jin, and H. Shinagawa,
Extreme ion heating in the dayside ionosphere in response to the arrival of a coronal mass ejection on 12 March 2012,
Ann. Geophys., 32, 831-839, doi:10.5194/angeo-32-831-2014, 2014.

Ishida, T., Y. Ogawa, A. Kadokura, Y. Hiraki, and I. Haggstrom,
Seasonal variation and solar activity dependence of the quiet-time ionospheric trough,
J. Geophys. Res., doi:10.1029/2014JA019996, 2014.

Ogawa, Y., T. Motoba, S. C. Buchert, I. Haggstrom and S. Nozawa,
Upper atmosphere cooling over the past 33 years,
Geophys. Res. Lett., 41, doi:10.1002/2014GL060591, 2014.

Oyama, S., Y. Miyoshi, K. Shiokawa, J. Kurihara, T. T. Tsuda, and B. J. Watkins,
Height-dependent ionospheric variations in the vicinity of nightside poleward expanding aurora after substorm onset,
J. Geophys. Res., 119, doi:10.1002/2013JA019704, 2014.

Sakai, J., K. Hosokawa, S. Taguchi, Y. Ogawa,
Storm-time enhancements of 630.0-nm airglow associated with polar cap patches,
J. Geophys. Res., 119, doi:10.1029/2013JA019197, 2014.

Nozawa, S., T. Kawahara, N. Saito, C. Hall, T. Tsuda, T. Kawabata, S. Wada, A. Brekke, T. Takahashi, H. Fujiwara, Y. Ogawa, and R. Fujii,
Variations of the neutral temperature and sodium density between 80 and 107 km above Tromsoe during the winter of 2010-2011 by a new solid state sodium LIDAR,
J. Geophys. Res., 119, doi:10.1029/2013JA019520, 2014.

Vickers, H., M. J. Kosch, E. Sutton, L. Bjoland, Y. Ogawa and C. La Hoz,
A solar cycle of upper thermosphere density observations from the EISCAT Svalbard Radar,
J. Geophys. Res., doi:10.1029/2014JA019885, 2014.

Kero, A., J. Vierinen, D. McKay-Bukowski, C.-F. Enell, M. Sinor, L. Roininen, and Y. Ogawa,
Ionospheric electron density profiles inverted from a spectral riometer measurement,
Geophys. Res. Lett., doi:10.1002/2014GL060986, 2014.

Kosch, M. J., H. Vickers, Y. Ogawa, A. Senior, and N. Blagoveshchenskaya,
First observation of the anomalous electric field in the topside ionosphere by ionospheric modification over EISCAT,
Geophys. Res. Lett., doi:10.1002/2014GL061679, 2014.

Kosch, M. J., C. Bryers, M.T. Rietveld, T. K. Yeoman, and Y. Ogawa,
Aspect angle sensitivity of pump-induced optical emissions at EISCAT,
Earth, Planets and Space, 1301071410132468, 2014.

2013

14 papers were published in 2013.

Refereed Journal Articles

Oyama, S., T. Watanabe, R. Fujii, S. Nozawa, and T. T. Tsuda,
Estimation of the layered ionospheric conductance using data from a multi-wavelength photometer at the European Incoherent Scatter (EISCAT) radar site,
Antarctic Record, 57(3), 339-356, 2013.

Ogawa, Y., M. Sawatsubashi, S. C. Buchert, K. Hosokawa, S. Taguchi, S. Nozawa, S. Oyama, T. T. Tsuda, and R. Fujii,
Relationship between auroral substorm and ion upflow in the nightside polar ionosphere,
J. Geophys. Res. Space Physics, 118, doi:10.1002/2013JA018965, 2013.

Tanaka, Y., A. Shinbori, T. Hori, Y. Koyama, S. Abe, N. Umemura, Y. Sato, M. Yagi, S. UeNo, Satoru, A. Yatagai, Y. Ogawa, and Y. Miyoshi,
Analysis software for upper atmospheric data developed by the IUGONET project and its application to polar science,
Advances in Polar Science, doi: 10.3724/SP.J.1085.2013.00231, vol. 24, No. 4, 231-240, 2013.

Yoshikawa, A., O. Amm, H. Vanhamaki, and R. Fujii,
Theory of Cowling channel formation by reflection of shear Alfven waves from the auroral ionosphere,
J. Geophys. Res. Space Physics, 118, 6416-6425, doi:10.1002/jgra.50514, 2013.

Yoshikawa, A., O. Amm, H. Vanhamaki, and R. Fujii,
Illustration of Cowling Channel Coupling to the Shear Alfven Wave,
J. Geophys. Res. Space Physics, 118, 6405-6415, doi:10.1002/jgra.50513, 2013.

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, and T. Nakamura,
Decrease in sodium density observed during auroral particle precipitation over Tromso, Norway,
Geophys. Res. Lett., 40, 4486-4490, doi:10.1002/grl.50897, 2013.

Matuura, N., T. Tsuda and S. Nozawa, Field-1 Aligned Current Loop Model on Formation of Sporadic Metal Layers,
J. Geophys. Res., 118, 4628-4639, doi:10.1002/jgra.50414, 2013.

Sakai, J., S. Taguchi , K. Hosokawa , Y. Ogawa,
Steep plasma depletion in dayside polar cap during a CME-driven magnetic storm,
J. Geophys. Res., 118, 462-471, doi:10.1029/2012JA018138, 2013.

Hosokawa, K., S. Taguchi, Y. Ogawa, and J. Sakai,
2D direct imaging of structuring of polar cap patches,
J. Geophys. Res., 118, 6536-6543, doi:10.1002/jgra.50577, 2013.

Hosokawa, K., S. Taguchi, Y. Ogawa, and T. Aoki,
Periodicities of polar cap patches,
J. Geophys. Res., 118, 447-453, doi:10.1029/2012JA018165, 2013.

Ogawa, Y., A. Kadokura, T. Motoba, Y. Tanaka, and 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.

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 and 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.

Amm, O., R. Fujii, H. Vanhamaki, A. Yoshikawa, and A. Ieda,
General solution for calculating polarization electric fields in the auroral ionosphere and application examples,
J. Geophys. Res., 118, doi:10.1002/jgra.50254, 2013.

Vickers, H., M. J. Kosch, E. Sutton, Y. Ogawa, and C. La Hoz,
Thermospheric atomic oxygen density estimates using the EISCAT Svalbard Radar,
J. Geophys. Res., 118, 1319-1330, doi:10.1002/jgra.50169, 2013.

2012

12 papers were published in 2012.

Refereed Journal Articles

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,
J. Atmos. Sol-Terr. Phys., 90-91, 26-44, 2012.

Sato, Y., T. Ono, N. Sato, and Y. Ogawa,
First observations of 4fce auroral roar emissions,
Geophys. Res. Lett., vol. 39, L07101, doi:10.1029/2012GL051205, 2012.

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, Planet and Space, vol. 64, 459-465, 2012.

Taguchi, S., K. Hosokawa, Y. Ogawa, T. Aoki, and M. Taguchi,
Double bursts inside a poleward-moving auroral form in the cusp,
J. Geophys. Res., 117, A12301, doi:10.1029/2012JA018150, 2012.

Fujii, R., O. Amm, H. Vanhamaki, A. Yoshikawa, and A. Ieda,
An application of the finite length Cowling channel model to auroral arcs with longitudinal variations,
J. Geophys. Res., vol 117, A11217, doi:10.1029/2012JA017953, 2012.

Oyama, S., J. Kurihara, B. J. Watkins, T. T. Tsuda, and T. Takahashi,
Temporal variations of the ion-neutral collision frequency from EISCAT observations in the polar lower ionosphere during periods of geomagnetic disturbances,
J. Geophys. Res., 117, A05308, doi:10.1029/2011JA017159, 2012.

Ogawa, Y., S. Nozawa, I. Haggstrom, S. Oyama, T. Motoba, T. Tsuda, A. Saito, Y. Miyashita, Y. Tanaka, G. Ueno, H. Miyaoka, and 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.

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, and Y. Ogawa,
Development of IUGONET data analysis software,
Journal of Space Science Informatics Japan, vol. 1, 91-98, 2012.
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.

Vanhamaki, H., A. Yoshikawa, O. Amm, and R. Fujii,
Ionospheric Joule heating and Poynting flux in quasi-static approximation,
J. Geophys. Res., 117, A0827, doi:10.1029/2012JA017841, 2012.

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

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, and Y. Ogawa,
Electron temperature in the cusp as measured with the SCIFER-2 sounding rocket
J. Geophys. Res., doi:10.1029/2011JA017404, 2012.