津田研 / Tsuda Lab.

研究論文 / Papers

  1. M. Kogure, T. Nakamura, M. K. Ejiri, T. Nishiyama, Y. Tomikawa, M. Tsutsumi, H. Suzuki, T. T. Tsuda, T. D. Kawahara, and M. Abo, Rayleigh/Raman lidar observations of gravity wave activity from 15 to 70 km altitude over Syowa (69ºS, 40ºE), the Antarctic, J. Geophys. Res. Atmospheres, 122, 7869-7880, doi:10.1002/2016JD026360, 2017.
  2. T. T. Tsuda, T. Nakamura, M. K. Ejiri, T. Nishiyama, K. Hosokawa, T. Takahashi, J. Gumbel, and J. Hedin, Statistical investigation of Na layer response to geomagnetic activity using resonance scattering measurements by Odin/OSIRIS, Geophys. Res. Lett., 44, 5943-5950, doi:10.1002/2017GL072801, 2017.
  3. T. D. Kawahara, S. Nozawa, N. Saito, T. Kawabata, T. T. Tsuda, and S. Wada, Sodium temperature/wind lidar based on laser-diode-pumped Nd:YAG lasers deployed at Tromsø, Norway (69.6ºN, 19.2ºE), Opt. Express, 25, A491-A501, doi:10.1364/OE.25.00A491, 2017.
  4. T. Takahashi, K. Hosokawa, S. Nozawa, T. T. Tsuda, Y. Ogawa, M. Tsutsumi, Y. Hiraki, 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. Space Physics, 122, 1212-1220, doi:10.1002/2016JA023472, 2017.
  5. S.-i. Oyama, 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, 3564–3577, doi:10.1002/2015JA022129, 2016.
  6. T. T. Tsuda, S. Nozawa, T. D. Kawahara, T. Kawabata, N. Saito, S. Wada, C. M. Hall, M. Tsutsumi, Y. Ogawa, S. Oyama, T. Takahashi, M. K. Ejiri, T. Nishiyama, T. Nakamura, and A. Brekke, A sporadic sodium layer event detected with five-directional lidar and simultaneous wind, electron density, and electric field observation at Tromsø, Norway, Geophys. Res. Lett., 42, 9190-9196, doi:10.1002/2015GL066411, 2015.
  7. T. Takahashi, 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 Tromsø (69.6ºN) during a night of high auroral activity, Ann. Geophys., 33, 941-953, doi:10.5194/angeo-33-941-2015, 2015.
  8. T. T. Tsuda, X. Chu, T. Nakamura, M. K. Ejiri, T. D. Kawahara, A. S. Yukimatu, and K. Hosokawa, A thermospheric Na layer event observed up to 140 km over Syowa Station (69.0ºS, 39.6ºE) in Antarctica, Geophys. Res. Lett., 42, 3647-3653, doi:10.1002/2015GL064101, 2015.
  9. T. Nishiyama, K. Sato, T. Nakamura, M. Tsutsumi, T. Sato, M. Kohma, K. Nishimura, Y. Tomikawa, M. K. Ejiri, and T. T. Tsuda, Height and time characteristics of seasonal and diurnal variations in PMWE based on 1 year observations by the PANSY radar (69.0ºS, 39.6ºE), Geophys. Res. Lett., 42, 2100-2108, doi: 10.1002/2015GL063349, 2015.
  10. S. Nozawa, T. D. Kawahara, N. Saito, C. M. Hall, T. 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. Space Physics, 119, 441-451, doi:10.1002/2013JA019520, 2014.
  11. S. Oyama, 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. Space Physics, 119, 4146-4156, doi:10.1002/2013JA019704, 2014.
  12. T. Takahashi, 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, doi:10.5194/angeo-32-1195-2014, 2014.
  13. N. Matuura, T. Tsuda, and S. Nozawa, Field-aligned current loop model on formation of sporadic metal layers, J. Geophys. Res. Space Physics, 118, 4628-4639, doi:10.1002/jgra.50414, 2013.
  14. S. Oyama, T. Watanabe, R. Fujii, S. Nozawa, and T. T. Tsuda, Layered conductance in the ionosphere estimated using data from a multi-wavelength photometer at the European Incoherent Scatter radar site, Antarctic Record, 57(3), 339-356, 2013.
  15. Y. Ogawa, 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, 7426-7437, doi:10.1002/2013JA018965, 2013.
  16. T. T. Tsuda, 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 Tromsø, Norway, Geophys. Res. Lett., 40, 4486-4490, doi:10.1002/grl.50897, 2013.
  17. Y. Ogawa, 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, 1, 83-89, 2012.
  18. S. Oyama, J. Kurihara, B. Watkins, 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.
  19. S. Nozawa, C. M. Hall, M. Tsutsumi, A. Brekke, Y. Ogawa, T. Tsuda, S. Oyama, and R. Fujii, Mean winds, tides, and quasi-2day waves above Bear Island, J. Atmos. Sol. Terr. Phys., 90-91, 26-44, 2012.
  20. M. J. Kosch, I. Yiu, C. Anderson, T. Tsuda, Y. Ogawa, S. Nozawa, A. Aruliah, V. Howells, L. J. Baddeley, I. W. McCrea, and J. A. 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., 116, A05321, doi:10.1029/2010JA016015, 2011.
  21. S. Oyama, A. Brekke, T. T. Tsuda, J. Kurihara, and B. J. Watkins, Variance of the vertical ion speed measured with the European Incoherent Scatter (EISCAT) UHF radar in the polar lower ionosphere at Tromsø, Norway, J. Geophys. Res., 116, A00K06, doi:10.1029/2010JA016129, 2011.
  22. T. T. Tsuda, 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 Tromsø, Norway, Geophys. Res. Lett., 38, L18102, doi:10.1029/2011GL048685, 2011.
  23. S. Nozawa, 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., 115, A08312, doi:10.1029/2009JA015237, 2010.
  24. S. Oyama, 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 during pulsating aurora at Tromsø, Norway, Ann. Geophys., 28, 1847-1857, doi:10.5194/angeo-28-1847-2010, 2010.
  25. T. T. Tsuda, 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.
  26. S. Oyama, T. T. Tsuda, T. Sakanoi, Y. Obuchi, K. Asamura, M. Hirahara, A. Yamazaki, Y. Kasaba, R. Fujii, S. Nozawa, and B. J. Watkins, Spatial evolution of frictional heating and the predicted thermospheric-wind effects in the vicinity of an auroral arc measured with the Sondrestrom incoherent-scatter radar and the Reimei satellite, J. Geophys. Res., 114, A07311, doi:10.1029/2009JA014091, 2009.
  27. S. Maeda, 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.
  28. J. Kurihara, 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, and 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.
  29. S. C. Buchert, T. Tsuda, R. Fujii, and S. Nozawa, The Pedersen current carried by electrons: a non-linear response of the ionosphere to magnetospheric forcing, Ann. Geophys., 26, 2837-2844, 2008.
  30. T. T. Tsuda, S. Nozawa, A. Brekke, Y. Ogawa, T. Motoba, R. Roble, and R. Fujii, An ion drag contribution to the lower thermospheric wind in summer polar region, J. Geophys. Res., 112, A06319, doi:10.1029/2006JA011785, 2007.
  31. S. Nozawa, Y. Ogawa, A. Brekke, T. Tsuda, C. M. Hall, H. Miyaoka, J. Kurihara, T. Abe, and R. Fujii, EISCAT observational results during the DELTA campaign, Earth Planets Space, 58, 1183-1191, 2006.

連絡先 / Contact

津田 卓雄 / Takuo TSUDA
EMAIL: takuo.tsuda at uec.ac.jp

リンク / Link

電通大 / UEC
津田研 / Tsuda Lab.
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