Research & Education

Publications

2016

5 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, March, 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, April 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, September, 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, October 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, September 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, August 2015.

Hosokawa, K. and Y. Ogawa,
Ionospheric variation during pulsating aurora,
J. Geophys. Res., DOI: 10.1002/2015JA021401, July 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, in press, 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, may 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, May 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, July 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, in press, 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年3月.

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年3月.

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

11 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.


2011

11 papers were published in 2011.

Refereed Journal Articles

Kitamura, N., Y. Ogawa, T. Nishimura, N. Terada, T. Ono, A. Shinbori, A. Kumamoto, V. Truhlik, and 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,
J. Geophys. Res., vol. 115, A07310,doi:10.1029/2009JA014766, 2011.

Ogawa, Y., S. C. Buchert, I. Haggstrom, M. T. Rietveld, R. Fujii, S. Nozawa, and H. Miyaoka,
On the statistical relation between ion upflow and naturally enhanced ion-acoustic lines observed with the EISCAT Svalbard radar,
J. Geophys. Res., vol. 116, A03313, doi:10.1029/2010JA015827, 2011.

Fujii, R., O. Amm, A. Yoshikawa, A. Ieda, H. Vanhamaki,
The reformulation and energy flow of the Cowling channel,
J. Geophys. Res., vol. 116, A02305, doi:10.1029/2010JA015989, 2011.

Oyama, S., A. Brekke, T. T. Tsuda, J. Kurihara, and B. J. Watkins,
Variance of the vertical ion speed measured with the EISCAT UHF radar in the polar lower ionosphere at Tromso, Norway
J. Geophys. Res., vol. 116, A00K06, doi:10.1029/2010JA016129, 2011.

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

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, and A. Brekke,
Fine structure of sporadic sodium layer observed with a sodium lidar at Tromso, Norway,
Geophys. Res. Lett., vol. 38, L18102, doi:10.1029/2011GL048685, 2011

Oyama, S., and B. J. Watkins,
Generation of atmospheric gravity waves in the polar thermosphere in response to auroral activity,
Space Science Review, doi:10.1007/s11214-011-9847-z, 2011.

Amm, O., R. Fujii, K. Kauristie, A. Yoshikawa, A. Ieda and H. Vanhamaki,
A statistical investigation of the Cowling channel efficiency in the auroral zone,
J. Geophys. Res., vol. 116, A02304, doi:10.1029/2010JA015988, 2011.

Kosch, M., I. Yiu, C. Anderson, T. Tsuda, Y. Ogawa, S. Nozawa, A. Aruliah, V. Howells, L. Baddeley, I. McCrea, and J. Wild,
Meso-scale observations of Joule heating near an auroral arc and ion-neutral collision frequency in the polar cap E-region,
J. Geophys. Res., vol. 116, A05321, doi:10.1029/2010JA016015, 2011.

Kosch, M. J., E. Mjolhus, M. Ashrafi, M. T. Rietveld, T. Yeoman, and S. Nozawa,
Angular dependence of pump-induced bottomside and topside ionospheric plasma turbulence at EISCAT,
J. Geophys. Res., 116, A03322, doi:10.1029/2010JA016014, 2011.

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


2010

8 papers were published in 2010.

Refereed Journal Articles

Oyama, S., K. Shiokawa, J. Kurihara, T. T. Tsuda, S. Nozawa, Y. Ogawa, Y. Otsuka, and B. J. Watkins,
Lower-thermospheric wind fluctuations measured with an FPI in pulsating aurora at Tromsoe, Norway,
Ann. Geophys., vol. 28, 1847-1857, 2010.

Kurihara, J., Y. Ogawa, S. Oyama, S. Nozawa, M. Tsutsumi, C. M. Hall, Y. Tomikawa, and R. Fujii,
Links between a stratospheric sudden warming and thermal structures and dynamics in the high-latitude mesosphere, lower thermosphere, and ionosphere,
Geophys. Res. Lett., vol. 37, L13806, doi:10.1029/2010GL043643, 2010.

Nozawa, S., Y. Ogawa, S. Oyama, H. Fujiwara, T. Tsuda, A. Brekke, C. M. Hall, Y. Murayama, S. Kawamura, H. Miyaoka, and R. Fujii,
Tidal waves in the polar lower thermosphere observed using the EISCAT long run data set obtained in September 2005,
J. Geophys. Res., vol. 115, A08312, doi:10.1029/2009JA015237, 2010.

Ogawa, Y., S. C. Buchert, A. Sakurai, S. Nozawa, and R. Fujii,
Solar activity dependence of ion upflow in the polar ionosphere observed with the EISCAT Tromso UHF radar,
J. Geophys. Res., vol. 115, A07310, doi:10.1029/2009JA014766, 2010.

Hosokawa, K., Y. Ogawa, A. Kadokura, H. Miyaoka and N. Sato,
Modulation of ionospheric conductance and electric field associated with pulsating aurora,
J. Geophys. Res., vol. 115, A03201, doi:10.1029/2009JA014683, 2010.

Hosokawa, K. and Y. Ogawa,
Pedersen current carried by electrons in auroral D-region,
Geophys. Res. Lett., vol. 37, L18103, doi:10.1029/2010GL044746, 2010.

Tanaka, Y., T. Aso, B. Gustavsson, K. Tanabe, A. Kadokura, and Y. Ogawa,
Reconstruction of auroral precipitating electrons by generalized auroral computed tomography,
Journal of IEICE , 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.

Kosch, M. J., Y. Ogawa, M. T. Rietveld, S. Nozawa and R. Fujii,
An analysis of pump-induced artificial ionospheric ion upwelling at EISCAT,
J. Geophys. Res., vol. 115, A12317, doi:10.1029/2010JA015854, 2010.


2009

7 papers were published in 2009.

Refereed Journal Articles

Ogawa, Y., I. Haggstrom, S. C. Buchert, K. Oksavik, S. Nozawa, M. Hirahara, A. P. van Eyken, T. Aso, and R. Fujii,
On the source of the polar wind in the polar topside ionosphere: First results from the EISCAT Svalbard radar,
Geophys. Res. Lett., 36, L24103, doi:10.1029/2009GL041501, 2009.

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,
J. Geophys. Res., 114, A12306, doi:10.1029/2009JA014392, 2009.

Maeda, S., Y. Ogawa, K. Hosokawa, S. Nozawa, S. Oyama, T. Tsuda, and A. Brekke,
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.

Fujii, R., Y. Iwata, S. Oyama, S. Nozawa, and Y. Ogawa,
Relations between proton auroras, intense electric field and ionospheric electron density depletion,
J. Geophys. Res., 114, A09304, doi:10.1029/2009JA014319, 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., 114, A06211, doi:10.1029/2009JA014128, 2009.

Ogawa, Y., S. C. Buchert, R. Fujii, S. Nozawa, and A. P. van Eyken,
Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar,
J. Geophys. Res., 114, A05305, doi:10.1029/2008JA013817, 2009.

Tsuda, T. 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, A04322, doi:10.1029/2008JA013867, 2009.


2008

10 papers are published in 2008.

Refereed Journal Articles

Ogawa, Y., K. Seki, M. Hirahara, K. Asamura, T. Sakanoi, S. C. Buchert, Y. Ebihara, Y. Obuchi,
A. Yamazaki, I. Sandahl, S. Nozawa, and R. Fujii,
Coordinated EISCAT Svalbard radar and Reimei satellite observations of ion upflows and suprathermal ions,
J. Geophys. Res., vol. 114, A05305, doi:10.1029/2008JA013817, 2009.

Amm, O., and R. Fujii,
Separation of Cowling channel and local closure currents in the vicinity of a substorm breakup spiral,
J. Geophys. Res., 113, A06304, doi:10.1029/2008JA013021, 2008.

Moen, J., Y. Rinne, H. C. Carlson, K. Oksavik, R. Fujii, and H. Opgenoorth,
On the relationship between thin Birkeland current arcs and reversed flow channels in the winter cusp/cleft ionosphere,
J. Geophys. Res., 113, A09220, doi:10.1029/2008JA013061, 2008.

Hall, C. M., C. Meek, A. Manson, S. Nozawa,
Turbopause determination, climatology and climatic trends, using medium frequency radars at 52degN and 70degN,
J. Geophys. Res., 113, D13104, doi:10.1029/2008JD009938, 2008.

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

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

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

Buchert, S. C., T. T. Tsuda, R. Fujii, and S. Nozawa,
The Pedersen current carried by electrons: Effects on magnetosphere-ionosphere coupling,
Ann. Geophys., 26, 2837-2844, 2008.

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,
Ann. Geophys., Vol 26, Issue 8, 2008, pp.2427-2433, 2008.

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

Non-Refereed Journal Article

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:

Tsuda, T. T., S. Nozawa, A. Brekke, Y. Ogawa, T. Motoba, R. Roble, and R. Fujii,
An ion-drag contribution to the lower thermospheric wind in the summer polar region,
J. Geophys. Res., vol. 112, Issue A6, A06319, doi:10.1029/2006JA011785, 2007.

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,
J. Geophys. Res., vol. 112, A08307, doi:10.1029/2006JA011942, 2007.

Lorentzen, D. A., P.M., Kintner, J. Moen, F. Sigernes, K. Oksavik, Y. Ogawa, and J. Holmes,
Pulsating dayside aurora in relation to ion upflow events during a northward IMF dominated by a strongly negative IMF BY,
J. Geophys. Res., vol 112, A03301, doi:10.1029/2006JA011757, 2007.

Yordanova, E., D. Sundkvist, S. Buchert, M. Andre, Y. Ogawa, M. Morooka, O. Margithu,
O. Amm A. N. Fazekerley, and H. Reme,
Energy Input from the Exterior Cusp into the Ionosphere: Correlated Ground-Based and Satellite Observations,
Geophys. Res. Lett., vol. 34, L04102, doi:10.1029/2006GL028617, 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,
Ann. Geophys., 25, 2393-2403, 2007.

Lunde, J., B. Gustavsson, U. P. Lovhaug, D. A. Lorentzen and Y. Ogawa,
Particle Precipitations during NEIAL events: Simultaneous Ground Based Observations at Svalbard,
Ann. Geophys., vol. 25, p1323-1336, 2007.

Simon, C., J. Lilensten, J. Moen, J. Holmes, Y. Ogawa, K. Oksavik, W. F. Denig,
TRANS4: a new electron/proton transport code - Application to the 22-01-2004 geophysical event,
Ann. Geophys., vol. 25, No. 3, p661-673, 2007.

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


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