Publications

2019

Nishitani, N. J.M. Ruohoniemi, M. Lester, J.B.H. Baker, A.V. Koustov, S.G. Shepherd, G. Chisham, T. Hori, E.G. Thomas, R.A. Makarevich, A. Marchaudon, P. Ponomarenko, J.A. Wild,  S.E. Milan, W.A. Bristow, J. Devlin, E. Miller, R.A. Greenwald, T. Ogawa (2019), and T. Kikuchi, Review of the accomplishments of Mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF Radars, Progress in Earth and Planetary Science, 6:27, https://doi.org/10.1186/s40645-019-0270-5 .

2018

Hori, T., N. Nishitani, S. G. Shepherd, J. M. Ruohoniemi, M. Connors, M. Teramoto, S. Nakano, K. Seki, N. Takahashi, S. Kasahara, S. Yokota, T. Mitani et al., Substorm-Associated Ionospheric Flow Fluctuations During the 27 March 2017 Magnetic Storm: SuperDARN-Arase Conjunction, Geophys. Res. Lett., https://doi.org/10.1029/2018GL079777, 2018.

Kunduri, B. S. R., J. B. H. Baker, J. M. Ruohoniemi, N. Nishitani, K. Oksavik, P. J. Erickson, A. J. Coster, S. G. Shepherd, W. A. Bristow, and E. S. Miller, A New Empirical Model of the Subauroral Polarization Stream, J. Geophys. Res., https://doi.org/10.1029/2018JA025690, 2018.

Shinbori, A., Y. Otsuka, T. Tsugawa, M. Nishioka, A. Kumamoto, F. Tsuchiya, S. Matsuda, Y. Kasahara, A. Matsuoka, J. M. Ruohoniemi, S. G. Shepherd, and N. Nishitani, Temporal and Spatial Variations of Storm Time Midlatitude Ionospheric Trough Based on Global GNSS-TEC and Arase Satellite Observations, Geophys. Res. Lett., https://doi.org/10.1029/2018GL078723, 2018.

Chakraborty, S., J. M. Ruohoniemi, J. B. H. Baker, and N. Nishitani, Characterization of Short-Wave Fadeout Seen in Daytime SuperDARN Ground Scatter Observations, Radio Sci., https://doi.org/10.1002/2017RS006488, 2018.

Berngardt, O. I., J. M. Ruohoniemi, N. Nishitani, S. G. Shepherd, W. A. Bristow, and E. S. Miller, Attenuation of decameter wavelength sky noise during x-ray solar flares in 2013-2017 based on the observations of midlatitude HF radars, J. Atmos. Sol. Terr. Phys., https://doi.org/10.1016/j.jastp.2018.03.022, 2018.

2017

Zou, Y., B. M. Walsh, Y. Nishimura, V. Angelopoulos, J. M. Ruohoniemi, K. A. McWilliams, and N. Nishitani, Spreading Speed of Magnetopause Reconnection X-Lines Using Ground-Satellite Coordination, Geophys. Res. Lett., https://doi.org/10.1002/2017GL075765, 2017.

Gallardo-Lacourt, B., Y. Nishimura, L. R. Lyons, E. V. Mishin, J. M. Ruohoniemi, E. F. Donovan, V. Angelopoulos, and N. Nishitani, Influence of Auroral Streamers on Rapid Evolution of Ionospheric SAPS Flows, J. Geophys. Res., https://doi.org/10.1002/2017JA024198, 2017.

Kim, S.-I., K.-H. Kim, H.-J. Kwon, H. Jin, E. Lee, G. Jee, N. Nishitani, T. Hori, M. Lester, and J. R. Wygant, SC-Associated Electric Field Variations in the Magnetosphere and Ionospheric Convective Flows, J. Geophys. Res., https://doi.org/10.1002/2017JA024611, 2017.

Lyons, L.R., B. Gallardo-Lacourt, Y. Zou, Y. Nishimura, P. Anderson, V. Angelopoulos, E.F. Donovan, J.M. Ruohoniemi, E. Mitchell, L.J. Paxton, and N. Nishitani, Driving of strong nightside reconnection and geomagnetic activity by polar cap flows: Application to CME shocks and possibly other situations, J. Atmos. Solar Terr. Phys., https://doi.org/10.1016/j.jastp.2017.09.013, 2017.

N. Takahashi, Y. Kasaba, Y. Nishimura, A. Shinbori, T. Kikuchi, T. Hori, Y. Ebihara and N. Nishitani, Propagation and evolution of electric fields associated with solar wind pressure pulses based on spacecraft and ground-based observations, Journal of Geophysical Research: Space Physics, Version of Record online : 23 AUG 2017, DOI: 10.1002/2017JA023990

2016

Kawano, H., A. S. Yukimatu, Y. Tanaka, S. Saita, N. Nishitani, and T. Hori, SC-triggered 1.6mHz waves including an interval with latitude-dependent phase shift, observed by the SuperDARN Hokkaido East Radar in mid latitudes: Possible global magnetospheric cavity-mode waves and their field-line resonance with poloidal Alfven-mode waves, Memoirs of the Faculty of Science, Kyushu University, Series D, Earth and Planetary Sciences, Vol. 34 (No. 1), pp. 1-15, Nov. 21, 2016. (published: 23 November, 2016)

Oinats, A.V., N. Nishitani, P. Ponomarenko, and K. Ratovsky, Diurnal and seasonal behavior of the Hokkaido East SuperDARN ground backscatter: simulation and observation, Earth, Planets and Space. 68:18, DOI: 10.1186/s40623-015-0378-9, 2016. (published: 09 February, 2016)

Teramoto, M. N. Nishitani, Y. Nishimura, and T. Nagatsuma, Latitudinal dependence on frequency of Pi2 pulsations near the plasmapause, using THEMIS satellites and Asian-Oceanian SuperDARN radars, Earth Planets Space, 68:22, doi: 10.1186/s40623-016-0397-1, 2016. (published: 17 February, 2016)

Lyons, L. R., B. Gallardo-Lacourt, S. Zou, J. M. Weygand, Y. Nishimura, W. Li, M Gkioulidou, V.Angelopoulos, E. F. Donovan, J. M. Ruohoniemi, B. J. Anderson, S. G. Shepherd, N. Nishitani (2016), The 17 March 2013 storm: Synergy of observations related to electric field modes and their ionospheric and magnetospheric Effects, J. Geophys. Res. Space Physics, 121, 10,880–10,897, doi:10.1002/2016JA023237.

Zou, Y., Y. Nishimura , J. Burchill , D. Knudsen , L. Lyons , K. Shiokawa , S. Buchert , S. Chen, M. J. Nicolls, J. M. Ruohoniemi, K. McWilliams, N. Nishitani (2016), Localized field-aligned currents in the polar cap associated with airglow patches, J. Geophys. Res. Space Physics, 121, 10,172–10,189, doi:10.1002/2016JA022665.

Oinats, A., N. Nishitani, P. Ponomarenko, O. Berngardt, and K. Ratovsky, Statistical characteristics of medium-scale traveling ionospheric disturbances revealed from the Hokkaido East and Ekaterinburg HF radar data, Earth, Planets and Space. 68:8, DOI: 10.1186/s40623-016-0390-8, 2016. (published: 21 January, 2016)

2015

Yakymenko, K.N, A. V. Koustov, and N. Nishitani, Statistical study of midlatitude E region echoes observed by the Hokkaido SuperDARN HF radar, J. Geophys. Res., 120, 9959-9976, doi:10.1002/2015JA021685, 2015. (published: 14 November, 2015)

Tsuda T. T., X. Chu, T. Nakamura, M. K. Ejiri, T. D. Kawahara, A. S. Yukimatu, and K. Hosokawa, A thermospheric Na layer observed up to 140 km over Syowa Station (69.0S, 39.6E) in Antarctica, Geophysical Research Letters, 42, 3647–3653. doi: 10.1002/2015GL064101, 2015

Hori, T., Y. Miyashita, Y. Miyoshi, K. Seki, T. Segawa, Y.-M. Tanaka, K. Keika, M. Shoji, I. Shinohara, K. Shiokawa, Y. Otsuka, S. Abe, A. Yoshikawa, K. Yumoto, Y. Obana, N. Nishitani, A. S. Yukimatu, T. Nagatsuma, M. Kunitake, K. Hosokawa, Y. Ogawa, K. T. Murata, M. Nose, H. Kawano, and T. Sakanoi, CDF data archive and integrated data analysis platform for ERG-related ground data developed by ERG Science Center (ERG-SC), Journal of Space Science Informatics Japan, JAXA Research and Development Report, 4 (JAXA-RR-14-009), 75-89, ISSN 1349-1113, 2015.

Hashimoto, A., K. Shiokawa, Y. Otsuka, S. Oyama, S. Nozawa, T. Hori, M. Lester, and M. G. Johnsen (2015), Statistical study of auroral fragmentation into patches, J. Geophys. Res. Space Phys., 120(8), 6207–6217, doi:10.1002/2015JA021000.

Hori T., A. Shinbori, S. Fujita, and N. Nishitani (2015), IMF-By dependence of transient ionospheric flow perturbation associated with sudden impulses: SuperDARN observations, Earth, Planets Space, 67:190, doi: 10.1186/s40623-015-0360-62015, 2015.
(published: 25 November, 2015)

Lyons, L. R, Y. Nishimura, B. Gallardo-Lacourt, M. J. Nicolls, S. Chen, D. L. Hampton, W. A. Bristow, J. M. Ruohoniemi, N. Nishitani, E. F. Donovan, and V. Angelopoulos (2015), Azimuthal flow bursts in the inner plasma sheet and possible connection with SAPS and plasma sheet earthward flow bursts, J. Geophys. Res. Space Physics, 120, doi: 10.1002/2015JA021023.

Nagano, H., N. Nishitani, and T. Hori (2015), Occurrence characteristics and lowest speed limit of Sub-Auroral Polarization Stream (SAPS) observed by the SuperDARN Hokkaido East radar, Earth Planets Space, 67:126, doi: 10.1186/s40623-015-0299-7, 2015.
(published: August 13, 2015)

Oinats, A.V., V.I. Kurkin, and N. Nishitani, Statistical study of medium-scale traveling ionospheric disturbances using SuperDARN Hokkaido ground backscatter data for 2011, Earth Planets Space, 67, 22, doi: doi:10.1186/s40623-015-0192-4, 2015.
(published: Feb 15, 2015)

Thomas, E. G., K. Hosokawa, J. Sakai, J. B. H. Baker, J. M. Ruohoniemi, S. Taguchi, K. Shiokawa, Y. Otsuka, A. J. Coster, J.-P. St.-Maurice, and K. A. McWilliams (2015), Multi-instrument, high-resolution imaging of polar cap plasma transportation, Radio Sci., in press.

Zou, Y., Y. Nishimura, L. R. Lyons, K. Shiokawa, E. F. Donovan, J. M. Ruohoniemi, K. A. McWilliams, and N. Nishitani(2015), Localized polar cap flow enhancement tracing using airglow patches: Statistical properties, IMF dependence, and contribution to polar cap convection. J. Geophys. Res. Space Physics, 120, 4064–4078. doi:10.1002/2014JA020946.

Ponomarenko, P., N. Nishitani, A.V. Oinats, T. Tsuya and J.-P. St.-Maurice (2015), Application of ground scatter returns for calibration of HF interferometry data, Earth Planets Space, 67:138, doi: 10.1186/s40623-015-0310-3, 2015.
(published: August 26, 2015)

2014

Hosokawa, K., Y. Takeda, A. Kadokura, A. S. Yukimatu, and N. Sato, Simultaneous NLC and PMSE Observations at Syowa, Antarctica, Antarctic Record, 57, 317-328, 2014

Hosokawa, K., S. Taguchi, K. Shiokawa, Y. Ogawa, and M. Nicolls, Global imaging of polar cap patches with dual airglow imagers, Geophysical Research Letters, 41, doi:10.1002/2013GL058748, 2014

Gallardo-Lacourt, B., Y. Nishimura, L. R. Lyons, J. M. Ruohoniemi, E. Donovan, V. Angelopoulos, K. A. McWilliams, and N. Nishitani (2014), Ionospheric flow structures associated with auroral beading at substorm auroral onset, J. Geophys. Res. Space Physics, 119, 9150–9159, doi:10.1002/2014JA020298.

Gallardo-Lacourt, B., Y. Nishimura, L. R. Lyons, S. Zou, V. Angelopoulos, E. Donovan, K. A. McWilliams, J. M. Ruohoniemi, and N. Nishitani, (2014), Coordinated SuperDARN THEMIS ASI observations of mesoscale flow bursts associated with auroral streamers, J. Geophys. Res. Space Physics, 119, 142–150, doi:10.1002/2013JA019245.

Koustov, A.V., K. N. Yakymenko, N. Nishitani, and P. V. Ponomarenko (2014), Hokkaido HF radar signatures of periodically reoccurring nighttime MSTIDs detected at short ranges, J. Geophys. Res., 119, 10.1002/2013JA019422, 1200-1218.

Nishimura, Y. L. R. Lyons, Y. Zou, K. Oksavik, J. I. Moen, L. B. Clausen, E. F. Donovan, V. Angelopoulos, K. Shiokawa, J. M. Ruohoniemi, N. Nishitani, K. A. McWilliams, M. Lester, (2014), Day-night coupling by a localized flow channel visualized by polar cap patch propagation, Geophys. Res. Lett., 41, 3701–3709, doi:10.1002/2014GL060301.

Shiokawa, K., A. Hashimoto, T. Hori, K. Sakaguchi, Y. Ogawa, E. Donovan, E. Spanswick, M. Connors, Y. Otsuka, S. Oyama, S. Nozawa, and K. McWilliams (2014), Auroral fragmentation into patches, J. Geophys. Res. Space Phys., 119(10), 8249–8261, doi:10.1002/2014JA020050.

Teramoto, M., N. Nishitani, V. Pilipenko, T. Ogawa, K. Shiokawa, T. Nagatsuma, A. Yoshikawa, D. Baishev, and K. T. Murata (2014), Pi2 pulsation simultaneously observed in the E and F region ionosphere with the SuperDARN Hokkaido radar, J. Geophys. Res. Space Physics, 119,3444–3462, doi:10.1002/2012JA018585.

Zou, Y., and N. Nishitani (2014), Study of mid-latitude ionospheric convection during quiet and disturbed periods using the SuperDARN Hokkaido radar, Adv. Space Res., 54, 473-480, http://dx.doi.org/10.1016/j.asr.2014.01.011.

Zou, Y., Y. Nishimura, L. R. Lyons, E. F. Donovan, J. M. Ruohoniemi, N. Nishitani, and K. A. McWilliams (2014), Statistical relationships between enhanced polar cap flows and PBIs, J. Geophys. Res. Space Physics, 119, 151–162, doi:10.1002/2013JA019269.

2013

Demissie, T. D., K. Hosokawa, N. H. Kleinknecht, P. J. Espy, R. E. Hibbins, Planetary wave oscillations observed in ozone and PMSE data from Antarctica, Journal of Atmospheric and Solar-Terrestrial Physics, 105-106, 207-213, 2013

Hosokawa, K., S. E. Milan, M. Lester, A. Kadokura, N. Sato, and G. Bjornsson, Large flow shears around auroral beads at substorm onset, Geophysical Research Letters, 40, doi:10.1002/grl.50958, 2013

Liu, E. X., H. Q. Hu, K. Hosokawa, R. Y. Liu, Z. S. Wu, Z. Y. Xing, First observations of Polar Mesosphere Summer Echoes by SuperDARN Zhongshan radar, Journal of Atmospheric and Solar-Terrestrial Physics, 104, 39-44, 2013

Grocott, A., K. Hosokawa, T. Ishida, M. Lester, S. E. Milan, M. P. Freeman, N. Sato, and A. S. Yukimatu (2013), Characteristics of medium-scale traveling ionospheric disturbances observed near the Antarctic Peninsula by HF radar, J. Geophys. Res. Space Physics, 118, 5830–5841, doi:10.1002/jgra.50515.

Hori, T., N. Nishitani, Y. Miyoshi, Y. Miyashita, K. Seki, T. Segawa, K. Hosokawa, A. S. Yukimatu, Y. Tanaka, N. Sato, M. Kunitake, and T. Nagatsuma, An integrated analysis platform merging the SuperDARN data within the THEMIS tool developed by ERG-Science Center (ERG-SC), Adv. Polar Sci., 24, doi: 10.3724/SP.J.1085.2013.000692013, 69-77, 2013.

Ichihara, A., N. Nishitani, T. Ogawa, and T. Tsugawa, Northward-propagating nighttime medium-scale traveling ionospheric disturbances observed with the SuperDARN Hokkaido HF radar and GEONET, Adv. Polar Sci., 24, 42-49, 2013.

Nishitani, N., T. Ogawa, S. Koustov, T. Hori, T. Kikuchi, Y. Ebihara, R. Kataoka, K. Hosokawa, and M. Teramoto (2013), Recurrent and propagating SAPS structures observed by the SuperDARN Hokkaido radar, J. Geophys. Res., under review.

Ogawa, T., N. Nishitani, S. Kawamura, and Y. Murayama (2013), Mesosphere summer echoes observed with the SuperDARN Hokkaido HF radar at Rikubetsu, Japan (43.5◦N), Earth Planets Space, 65, 1593–1597, doi:10.5047/eps.2013.07.009.

Perry, G. W., J.-P. St.-Maurice, and K. Hosokawa (2013), The interconnection between cross-polar cap convection and the luminosity of polar cap patches, J. Geophys. Res. Space Physics, 118, 7306–7315, doi:10.1002/2013JA019196.

Watanabe, D., and N. Nishitani, Study of ionospheric disturbances during solar flare events with the SuperDARN Hokkaido Radar, Adv. Polar Sci., 24, 12-18, 2013.

2012

Dahlgren, H., G. W. Perry, J. L. Semeter, J.-P. St.-Maurice, K. Hosokawa, M. J. Nicolls, M. Greffen, K. Shiokawa, and C. Heinselman, Space-time variability of polar cap patches: Direct evidence for internal plasma structuring, J. Geophys. Res., 117, A09312, doi:10.1029/2012JA017961, 2012

Hori, T., A. Shinbori, N. Nishitani, T. Kikuchi, S. Fujita, T. Nagatsuma, O. Troshichev, K. Yumoto, A. Moiseyev, and K. Seki, Evolution of negative SI-induced ionospheric flows observed by SuperDARN King Salmon HF radar, J. Geophys. Res., 117, A12223, doi:10.1029/2012JA018093, 2012

Hosokawa K., Taguchi S., Ogawa Y., Aoki T., (2012), Periodicities of polar cap patches, J. Geophys. Res.: Space Physics, 118, doi:10.1029/2012JA018165.

Kim, K.-H., D.-H. Lee, K. Shiokawa, E. Lee, J.-S. Park, H.-J. Kwon, V. Angelopoulos, Y.-D. Park, J. Hwang, N. Nishitani, T. Hori, K. Koga, T. Obara, K. Yumoto, and D. G. Baishev, Magnetospheric responses to the passage of the interplanetary shock on 24 November 2008, J. Geophys. Res., 117, A10209, doi:10.1029/2012JA017871, 2012

Koustov, A.V., K. Hosokawa, N. Nishitani, K. Shiokawa, and H. Liu, Signatures of moving polar cap arcs in the F-region PolarDARN echoes, Ann. Geophys.,30, 441-455, 2012

Mori, D., A. V. Koustov, P. T. Jayachandran, and N. Nishitani, Resolute Bay CADI ionosonde drifts, PolarDARN HF velocities, and cross polar cap potential, Radio Sci., 47, RS3003, doi:10.1029/2011RS004947, 2012.

Motoba, T., K. Hosokawa, Y. Ogawa, N. Sato, A. Kadokura, S. E. Milan, and M. Lester, Simultaneous ground-satellite observations of meso-scale auroral arc undulations, J. Geophys. Res., 117, A06213, doi:10.1029/2011JA017291, 2012.

Ogawa, T., N. Nishitani, T. Tsugawa, and K. Shiokawa, Giant ionospheric disturbances observed with the SuperDARN Hokkaido HF radar and GPS network after the 2011 Tohoku earthquake, Earth Planets Space, 64, 12, 1295-1307, 2012.

Sakaguchi, K., T. Nagatsuma, T. Ogawa, T. Obara, and O.A. Troshichev, Ionospheric Pc5 plasma oscillations observed by the King Salmon HF radar and their comparison with geomagnetic pulsations on the ground and in geostationary orbit, J. Geophys. Res., 117, A03218, doi:10.1029/2011JA016923, 2012

2011

Kitanoya, Y., T. Abe, A. W. Yau, T. Hori, and N. Nishitani, Localized electron density enhancements in the high-altitude polar ionosphere and their relationships with storm-enhanced density (SED) plumes and polar tongues of ionization (TOI), Ann. Geophys., 29, 367-375, 2011

Liu, J. J., H. Q. Hu, D. S. Han, T. Araki, Z. J. Hu, Q. H. Zhang, H. G. Yang, N. Sato, A. S. Yukimatu, and Y. Ebihara Decrease of auroral intensity associated with reversal of plasma convection in response to an interplanetary shock as observed over Zhongshan station in Antarctica, J. Geophys. Res., 116, A03210, doi:10.1029/2010JA016156, 2011

Lyons, L.R., Y. Nishimura, H.-J. Kim, E. Donovan, V. Angelopoulos, G. Sofko, M. Nicolls, C. Heinselman, J.M. Ruohoniemi, and N. Nishitani Possible connection of polar cap flows to pre- and post-substorm onset PBIs and streamers, J. Geophys. Res., 116, A12225, doi:10.1029/2011JA016850, 2011.

Miyashita, Y., Y. Kamide, K. Liou, C.-C. Wu, A. Ieda, N. Nishitani, S. Machida, Y. Saito, and T. Mukai, Successive substorm expansions during a period of prolonged northward interplanetary magnetic field, J. Geophys. Res., 116, A09221, 2011

Nishitani, N., T. Ogawa, Y. Otsuka, K. Hosokawa and T. Hori, Propagation of large amplitude ionospheric disturbances with velocity dispersion observed by the SuperDARN Hokkaido radar after the 2011 off the Pacific coast of Tohoku Earthquake, Earth Planets and Space, 63 (7), 891-896 DOI: 10.5047/eps.2011.07.003, 2011

Wild, J. A., E. E. Woodfield, E. Donovan, R. C. Fear, A. Grocott, M. Lester, A. N. Fazakerley, E. Lucek, Y. Khotyaintsev, M. Andre, A. Kadokura, K. Hosokawa, C. Carlson, J. P. McFadden, K. H. Glassmeier, V. Angelopoulos, and G. Björnsson, Midnight sector observations of auroral omega bands, J. Geophys. Res., 116, A00I30, doi:10.1029/2010JA015874, 2011

2010

Grocott, A., S. E. Milan, T. K. Yeoman, N. Sato, A. S. Yukimatu, and J. A. Wild, Superposed epoch analysis of the ionospheric convection evolution during substorms: IMF BY dependence, J. Geophys. Res., 115, A00I06, doi:10.1029/2010JA015728, 2010

Hayashi, H., N. Nishitani, T. Ogawa, Y. Otsuka, T. Tsugawa, K. Hosokawa, and A. Saito, Large-scale traveling ionospheric disturbance observed by SuperDARN Hokkaido HF radar and GPS networks on 15 December 2006, J. Geophys. Res., 115, A06309, doi:10.1029/2009JA014297, 2010

Hosokawa, K., and N. Nishitani, Plasma irregularities in the duskside subauroral ionosphere as observed with midlatitude SuperDARN radar in Hokkaido, Japan, Radio Sci., 45, RS4003, doi:10.1029/2009RS004244, 2010

Hosokawa, K., J.-P. St-Maurice, G. J. Sofko, K. Shiokawa, Y. Otsuka, and T. Ogawa, Reoranization of polar cap patches through shears in the background plasma convection, J. Geophys. Res., 115, A01303, doi:10.1029/2009JA014599, 2010

Hosokawa, K., T. Motoba, A.S. Yukimatu, S.E. Milan, M. Lester, A. Kadokura, N. Sato and G. Bjornsson, Plasma irregularities adjacent to patches of diffuse aurora in the post-midnight sector, J. Geophys. Res., 115, A09303, doi:10.1029/2010JA015319, 2010.

Hosokawa, K., T. Tsugawa, K. Shiokawa, Y. Otsuka, N. Nishitani, T. Ogawa, and M. R. Hairston, Dynamic temporal evolution of polar cap tongue of ionization during magnetic storm, J. Geophys. Res., 115, A12333, doi:10.1029/2010JA015848, 2010

Kikuchi, T., Y. Ebihara, K. K. Hashimoto, R. Kataoka, T. Hori, S. Watari, and N. Nishitani, Penetration of the convection and overshielding electric fields to the equatorial ionosphere during a quasiperiodic DP 2 geomagnetic fluctuation event, J. Geophys. Res., 115, A05209, doi:10.1029/2008JA013948, 2010

Nishimura, Y., L. R. Lyons, S. Zou, X. Xing, V. Angelopoulos, S. B. Mende, J. W. Bonnell, D. Larson, U. Auster, T. Hori, N. Nishitani, K. Hosokawa, G. Sofko, M. Nicolls, and C. Heinselman, Preonset time sequence of auroral substorms: Coordinated observations by all-sky imagers, satellites, and radars, J. Geophys. Res., 115, A00I08, doi:10.1029/2010JA015832, 2010

Taguchi, S., K. Hosokawa, S. Suzuki, A. Tawara, H. U. Frey, J. Matzka, A. S. Yukimatu, and N. Sato, Plasma flow during the brightening of proton aurora in the cusp, J. Geophys. Res., 115, A10308, doi:10.1029/2010JA015535 . 2010

Taguchi, S., K. Hosokawa, S. Suzuki, A. S. Yukimatu, and N. Sato, Initial development of HF radar polar patch caused by azimuthal flow burst in the cusp, J. Geophys. Res., 115, A05305, doi:10.1029/2009JA014631, 2010

2009

Ebihara, Y., N. Nishitani, T. Kikuchi, T. Ogawa, K. Hosokawa, M. -C. Fok and M. F. Thomsen, Dynamical property of storm-time subauroral rapid flows as a manifestation of complex structures of the plasma pressure in the inner magnetosphere, J. Geophys. Res., 114, A01306, doi:10.1029/2008JA013614, 2009.

Hosokawa, K., K. Shiokawa, Y. Otsuka, T. Ogawa, J.P. St-Maurice, G.J. Sofko and D.A. Andre, Relationship between polar cap patches and field-aligned irregularities as observed with an all-sky airglow imager at Resolute Bay and the PolarDARN radar at Rankin Inlet, J. Geophys. Res., 114, A03306, doi:10.1029/2008JA013707, 2009

Kataoka, R., K. Hosokawa, N. Nishitani, and Y. Miyoshi, SuperDARN Hokkaido radar observation of westward flow enhancement in subauroral latitudes, Ann. Geophys., 27, 1695-1699, 2009

Koustov, A., N. Nishitani, P. V. Ponomarenko, K. Shiokawa, S. Suzuki, B. M. Shevtsov, and J. W. MacDougall, Joint observations of a traveling ionospheric disturbance with the Paratunka OMTI camera and the Hokkaido HF radar ,Annales Geophysicae, 27, 2399-2406, 2009

Maeda, S., Y. Ogawa, K. Hosokawa, S. Nozawa, S. Oyama, T. Tsuda, and A. Brekke (2009), Ion heating in high-speed flow channel within the duskside cell of the polar cap ion convection under large IMF-By condition, J. Geophys. Res., 114, A11307, doi:10.1029/2009JA014300, 2009

Ogawa, T., N. Nishitani, Y. Otsuka, K. Shiokawa, T. Tsugawa, and K. Hosokawa, Medium-scale traveling ionospheric disturbances observed with the SuperDARN Hokkaido radar, all-sky imager and GPS network, and their relation to concurrent sporadic-E irregularities, J. Geophys. Res., 114, A03316, doi:10.1029/2008JA013893, 2009

Suzuki, S., K. Hosokawa, T. Shibata, K. Shiokawa, Y. Otsuka, N. Nishitani, T. Ogawa, and A.V. Koustov, Coordinated observations of nighttime medium-scale traveling ionospheric disturbances in 630-nm airglow and HF radar echoes at midlatitudes, J. Geophys. Res., 114, A07312, doi:10.1029/2008JA013963, 2009

Taguchi, S., K. Hosokawa, A. Nakao, M.R. Collier, T.E. Moore, N. Sato, and A.S. Yukimatu, HF radar polar patch and its relation with the cusp during By-dominated IMF: Simultaneous observations at two altitudes, J. Geophys. Res., 114, doi:10.1029/2008JA013624, 2009

Taguchi, S., S. Suzuki, K. Hosokawa, Y. Ogawa, A. S. Yukimatu, N. Sato, M.R. Collier, and T.E. Moore, Moving meso-scale plasma precipitation in the cusp, J. Geophys. Res., , , 2009

Tsuda, T., S. Nozawa, S. Oyama, T. Motoba, Y. Ogawa, H. Shinagawa, N. Nishitani, K. Hosokawa, N. Sato, M. Lester and R. Fujii, Acceleration mechanism of high-speed neutral wind observed in the polar lower thermosphere, J. Geophys. Res., 114, doi:10.1029/2008JA013867, 2009

Tsutsumi, M., A. S. Yukimatu, D. A. Holdsworth, and M. Lester, Advanced SuperDARN meteor wind observations based on raw time series analysis technique, Radio Sci., 44, RS2006, doi:10.1029/2008RS003994, 2009

2008

Ebihara, Y., N. Nishitani, T. Kikuchi, T. Ogawa, K. Hosokawa, M. -C. Fok and M. F. Thomsen, Dynamical property of storm-time subauroral rapid flows as a manifestation of complex structures of the plasma pressure in the inner magnetosphere, J. Geophys. Res., 114, A01306, doi:10.1029/2008JA013614, 2008

Hosokawa, K., A. Kadokra, N. Sato, S.E. Milan, M. Lester, G. Bjornsson and Th. Saemundsson, Electric field modulation behind pulsating aurora, J. Geophys. Res., 113, A11322, doi:10.1029/2008JA013601, 2008.

Ishida, T., K. Hosokawa, T. Shibata, S. Suzuki, N. Nishitani, and T. Ogawa, SuperDARN observations of daytime MSTIDs in the auroral and mid-latitudes: Possibility of long-distance propagation,Geophys. Res. Lett., 35, L13102, doi:10.1029/2008GL034623, 2008

Koustov, A., K. Hosokawa, N. Nishitani, T. Ogawa, and K. Shiokawa, Rankin Inlet PolarDARN radar observations of duskward moving Sun-aligned optical forms, Ann. Geophys., 26, 2711-2723, 2008

Koustov, A., N. Nishitani, Y. Ebihara, T. Kikuchi, M. R. Hairston, and D. Andre, Subauroral polarization streams: Observations with the Hokkaido and King Salmon SuperDARN radars and modeling,Annales Geophysicae, 26, 3317-3327, 2008

Milan, S.E., K. Hosokawa, M. Lester, N. Sato, H. Yamagishi, and F. Honary, D region HF radar echoes associated with energetic particle precipitation and pulsating aurora, Ann. Geophys., 26, 1897-1904, 2008

Miyashita, Y., K. Hosokawa, T. Hori, Y. Kamide, A. S. Yukimatu, M. Fujimoto, T. Mukai, S. Machida, N. Sato, Y. Saito, I. Shinohara, and J. B. Sigwarth, Response of large-scale ionospheric convection to substorm expansion onsets: A case study, J. Geophys. Res., 113, A12309, doi:10.1029/2008JA013586, 2008

Shiokawa, K., Y. Otsuka, N. Nishitani, T. Ogawa, T. Tsugawa, T. Maruyama, S. E. Smirnov, V. V. Bychkov, and B. M. Shevtsov, Northeastward motion of nighttime MSTIDs at middle latitudes observed by an airglow imager, J. Geophys. Res., 113, A12312, doi:10.1029/2008JA013417, 2008

2007

Ebihara Y, N. Nishitani, T. Kikuchi, T. Ogawa, K. Hosokawa, and M.-C. Fok, Two-dimensional observations of overshielding during a magnetic storm by the SuperDARN Hokkaido radar, J. Geophys. Res., 113, doi:10.1029/2007JA012641, 2007

Fujiwara, H. R. Kataoka, M. Suzuki, S. Maeda, S. Nozawa, K. Hosokawa, H. Fukunishi, N. Sato and 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

Kataoka, R., N. Nishitani, Y. Ebihara, K. Hosokawa, T. Ogawa, T. Kikuchi, and Y. Miyoshi, Dynamic variations of a convection flow reversal in the subauroral postmidnight sector as seen by the SuperDARN Hokkaido HF radar,Geophys. Res. Lett., 34, doi:10.1029/2007GL031552, 2007

Murata, Y., S. Taguchi, K. Hosokawa, A. Nakao, M.R. Collier, T.E. Moore, N. Sato, H. Yamagishi, A.S. Yukimatu, Correlative variations of the neutral atom emission in the high-altitude cusp and the fast anti-sunward convection in the low-altitude cusp, J. Geophys. Res., 112, doi:10.1029/2007JA012404, 2007

Shiokawa, K., G. Lu, Y. Otsuka, T. Ogawa, M. Yamamoto, N. Nishitani and N. Sato, Ground observation and AMIE-TIEGCM modelling of a storm-time travelling ionospheric disturbance, J. Geophys. Res., 112, A05308, doi:10.1029/2006JA011772, 2007

2006

Taguchi, S., K. Hosokawa, A. Nakao, M.R. Collier, T.E. Moore, A. Yamazaki, N. Sato, and A.S. Yukimatu, Neutral atom emission in the direction of the high-latitude magnetopause for northward IMF: Simultaneous observations from IMAGE spacecraft and SuperDARN radar,Geophys. Res. Lett., 33, doi:10.1029/2005GL025020, 2006

Taguchi, S., K. Hosokawa, Y. Murata, A. Nakao, M. R. Collier, T. E. Moore, A. Yamazaki, N. Sato, and A. S. Yukimatu, Neutral atom emission coming from the direction of the high-latitude magnetopause under northward IMF,Advances in Polar Upper Atmospheric Research, 20, 17-26, 2006

2005

Hosokawa, K., T. Ogawa, N. Arnold, M. Lester, N. Sato and A. Yukimatu, Extraction of Polar Mesosphere Summer Echoes from SuperDARN data,Geophys. Res. Lett., 32, L12801, 10.1029/2005GL022788, 2005

Miyashita, Y., A. Ieda, Y. Kamide, S. Machida, T. Mukai, Y. Saito, K. Liou, C.-I. Meng, G.K. Parks, M. Nose, R.W. McEntire, F. Creutzberg, N. Nishitani, H.J. Singer, and J.-P. Villain, Plasmoids observed in the near-Earth magnetotail at X ~ -7 RE, J. Geophys. Res., 110, A12214, doi:10.1029/2005JA011263, 2005

Nishitani, N., and T. Ogawa, Model calculations of possible ionospheric backscatter echo area for a mid-latitude HF radar, Adv. Polar Upper Atmos. Res., 19, 55-62, 2005.

2004

Hosokawa, K., S. Yamasita, P. Stauning, N. Sato, A. S. Yukimatu and T. Iyemori, Origin of the SuperDARN broad Doppler spectra: simultaneous observation with Oersted satellite magnetometer, Ann. Geophys., 22, 159-168, 2004

Hosokawa, K., T. Ogawa, N. Sato, A.S. Yukimatu, and T. Iyemori, Statistics of Antarctic Mesospheric Echoes Observed with the SuperDARN Syowa Radar,Geophys. Res. Lett., 31, doi:10.1029/2003GL018776, 2004

McWilliams, K.A., G. J. Sofko, T. K. Yeoman, S. E. Milan, D. G. Sibeck, T. Nagai, T. Mukai, I. J. Coleman, T. Hori, F. J. Rich, Simultaneous observations of magnetopause flux transfer events and of their associated signatures at ionospheric altitudes,Ann. Geophysicae, 22, 2181-2199, 2004

Nishitani, N., M. Lester, S.E. Milan, T. Ogawa, N. Sato, H. Yamagishi, A.S. Yukimatu, and F.J. Rich, Unusual ionospheric echoes with high velocity and very low spectral width observed by the SuperDARN radars in the polar cap during high geomagnetic activity, J. Geophys. Res., 109, A02311, 10.1029/2003JA010048, 2004

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,Ann. Geophysicae, 22, 4049-4059, 2004

Taguchi, S., K. Hosokawa, M.R. Collier, M.-C. Fok, A.S. Yukimatu, N. Sato, and R.A. Greenwald, Simultaneous observations of the cusp with IMAGE Low Energy Neutral Atoms Imager and SuperDARN radar,Advances in Polar Upper Atmospheric Research,, 18, 53-64, 2004