Papers - OTSUKA, Yuichi
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Medium-scale traveling ionospheric disturbances detected with dense and wide TEC maps over North America Reviewed Open Access
T. Tsugawa, Y. Otsuka, A. J. Coster, A. Saito
GEOPHYSICAL RESEARCH LETTERS Vol. 34 ( 22 ) 2007.11
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Summer-winter hemispheric asymmetry of the sudden increase in ionospheric total electron content and of the O/N2 ratio: Solar activity dependence Reviewed Open Access
T. Tsugawa, S. R. Zhang, A. J. Coster, Y. Otsuka, J. Sato, A. Saito, Y. Zhang, L. J. Paxton
Journal of Geophysical Research: Space Physics Vol. 112 ( A8 ) 2007.8
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Low-latitude total electron content enhancement at low geomagnetic activity observed over Japan Reviewed Open Access
Ivan Kutiev, Yuichi Otsuka, Akinori Saito, Takuya Tsugawa
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 112 ( A7 ) 2007.7
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Simultaneous observations of nighttime medium-scale traveling ionospheric disturbances and E region field-aligned irregularities at midlatitude Reviewed Open Access
Y. Otsuka, F. Onoma, K. Shiokawa, T. Ogawa, M. Yamamoto, S. Fukao
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 112 ( A6 ) 2007.6
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Ground observation and AMIE-TIEGCM modeling of a storm-time traveling ionospheric disturbance Reviewed Open Access
Shiokawa, K, Lu, G, Otsuka, Y, Ogawa, T, Yamamoto, M, Nishitani, N, Sato, N
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 112 ( A5 ) 2007.5
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Simultaneous ground and satellite observations of an isolated proton arc at subauroral latitudes Reviewed Open Access
K. Sakaguchi, K. Shiokawa, A. Ieda, Y. Miyoshi, Y. Otsuka, T. Ogawa, M. Connors, E. F. Donovan, F. J. Rich
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 112 ( A4 ) 2007.4
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An intense gravity wave near the mesopause region observed by a Fabry-Perot interferometer and an airglow imager Reviewed Open Access
K. Shiokawa, S. Suzuki, Y. Otsuka, T. Ogawa, T. Nakamura, T. Horinouchi
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 112 ( D7 ) 2007.4
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Takuya Tsugawa, Nobuki Kotake, Yuichi Otsuka, Akinori Saito
GPS SOLUTIONS Vol. 11 ( 2 ) page: 139 - 144 2007.3
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A concentric gravity wave structure in the mesospheric airglow images Reviewed
S. Suzuki, K. Shiokawa, Y. Otsuka, T. Ogawa, K. Nakamura, T. Nakamura
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 112 ( D2 ) 2007.1
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Simultaneous observations of nighttime medium-scale traveling ionospheric disturbances and E-region field-aligned irregularities at midlatitude Reviewed
Otsuka, Y., F. Onoma, K. Shiokawa, T. Ogawa, M. Yamamoto, and S. Fukao
J. Geophys. Res page: doi:10.1029/2005JA011548 2007
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Statistical study of medium-scale traveling ionospheric disturbances observed with the GPS networks in Southern California Reviewed Open Access
Nobuki Kotake, Yuichi Otsuka, Tadahiko Ogawa, Takuya Tsugawa, Akinori Saito
EARTH PLANETS AND SPACE Vol. 59 ( 2 ) page: 95 - 102 2007
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The ionospheric response in the Brazilian sector during the super geomagnetic storm on 20 November 2003 Reviewed Open Access
F. Becker-Guedes, Y. Sahai, P. R. Fagundes, E. S. Espinoza, V. G. Pillat, W. L. C. Lima, Su. Basu, Sa. Basu, Y. Otsuka, K. Shiokawa, E. M. MacKenzie, X. Pi, J. A. Bittencourt
ANNALES GEOPHYSICAE Vol. 25 ( 4 ) page: 863 - 873 2007
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Development of airglow temperature photometers with cooled-CCD detectors Reviewed Open Access
K. Shiokawa, Y. Otsuka, S. Suzuki, T. Katoh, Y. Katohl, M. Satoh, T. Ogawa, H. Takahashi, D. Gobbli, T. Nakamura, B. P. Williams, C.-Y. She, M. Taguchi, T. Shimomai
EARTH PLANETS AND SPACE Vol. 59 ( 6 ) page: 585 - 599 2007
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Y. Sahai, F. Becker-Guedes, P. R. Fagundes, W. L. C. Lima, Y. Otsuka, C. -S. Huang, E. S. Espinoza, X. Pi, A. J. de Abreu, M. J. A. Bolzan, V. G. Pillat, J. R. Abalde, A. A. Pimenta, J. A. Bittencourt
ADVANCES IN SPACE RESEARCH Vol. 39 ( 8 ) page: 1325 - 1334 2007
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Gravity wave momentum flux in the upper mesosphere derived from OH airglow imaging measurements Reviewed Open Access
Shin Suzuki, Kazuo Shiokawa, Yuichi Otsuka, Tadahiko Ogawa, Minoru Kubota, Masaki Tsutsumi, Takuji Nakamura, David C. Fritts
EARTH PLANETS AND SPACE Vol. 59 ( 5 ) page: 421 - 428 2007
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Summer-winter hemispheric asymmetry of sudden increase in ionospheric total electron content induced by solar flares: A role of O/N<sub>2</sub> ratio Reviewed Open Access
T. Tsugawa, T. Sadakane, J. Sato, Y. Otsuka, T. Ogawa, K. Shiokawa, A. Saito
Journal of Geophysical Research A: Space Physics Vol. 111 ( A11 ) 2006.11
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A fast-propagating, large-scale atmospheric gravity wave observed in the WAVE2004 campaign Reviewed
Minoru Kubota, Seiji Kawamura, Makoto Abo, Yoshiko Koizumi, Yasuhiro Murayama, Miho Yamamori, Kazuo Shiokawa, Yuichi Otsuka, Michihiro Uchiumi, Kiyoshi Igarashi, Takumi Abe, Koh-Ichiro Oyama, Naomoto Iwagami
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 111 ( D21 ) 2006.11
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Detection of ruptures of Andaman fault segments in the 2004 great Sumatra earthquake with coseismic ionospheric disturbances Reviewed Open Access
Kosuke Heki, Yuichi Otsuka, Nithiwatthn Choosakul, Narong Hemmakorn, Tharadol Komolmis, Takashi Maruyama
Journal of Geophysical Research: Solid Earth Vol. 111 ( B9 ) 2006.9
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Estimating drift velocity of polar cap patches with all-sky airglow imager at Resolute Bay, Canada Reviewed
K. Hosokawa, K. Shiokawa, Y. Otsuka, A. Nakajima, T. Ogawa, J. D. Kelly
GEOPHYSICAL RESEARCH LETTERS Vol. 33 ( 15 ) 2006.8
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A multi-instrument measurement of a mesospheric front-like structure at the equator Reviewed Open Access
Kazuo Shiokawa, Shin Suzuki, Yuichi Otsuka, Tadahiko Ogawa, Takuji Nakamura, Martin G. Mlynczak, James M. Russell
JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN Vol. 84A page: 305 - 316 2006.7