研究者詳細 - 大塚　雄一

論文 - 大塚　雄一

分割表示 484 件中 421 - 440 件目／全件表示 >>

Efficacy of STI571 for a patient with metastatic gastrointestinal stromal tumor 査読有り

Sasaki, Y, Niwa, Y, Ando, N, Otsuka, Y, Ohmiya, N, Hirooka, Y, Itoh, A, Furuta, S, Goto, H

HEPATO-GASTROENTEROLOGY 52 巻 ( 66 ) 頁： 1764 - 1767 2005年11月

Observations of equatorial plasma bubbles using broadcast VHF radio waves 査読有り

Nakata, H; Nagashima, I; Sakata, K; Otsuka, Y; Akaike, Y; Takano, T; Shimakura, S; Shiokawa, K; Ogawa, T

GEOPHYSICAL RESEARCH LETTERS 32 巻 ( 17 ) 2005年9月

Geomagnetic conjugate observation of nighttime medium-scale and large-scale traveling ionospheric disturbances: FRONT3 campaign

Shiokawa, K; Otsuka, Y; Tsugawa, T; Ogawa, T; Saito, A; Ohshima, K; Kubota, M; Maruyama, T; Nakamura, T; Yamamoto, M; Wilkinson, P

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 110 巻 ( A5 ) 頁： doi:10.1029/2004JA010845 2005年5月

Total electron content behavior over Japan during geomagnetic storms 査読有り

Kutiev, I; Watanabe, S; Otsuka, Y; Saito, A

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 110 巻 ( A1 ) 2005年1月

Relationship between propagation direction of gravity waves in OH and OI airglow images and VHF radar echo occurrence during the SEEK-2 campaign 査読有り

Onoma, F; Otsuka, Y; Shiokawa, K; Ogawa, T; Yamamoto, M; Fukao, S; Saito, S

ANNALES GEOPHYSICAE 23 巻 ( 7 ) 頁： 2385 - 2390 2005年

Simultaneous ground- and satellite-based airglow observations of geomagnetic conjugate plasma bubbles in the equatorial anomaly 査読有り

Ogawa, T; Sagawa, E; Otsuka, Y; Shiokawa, K; Immel, TI; Mende, SB; Wilkinson, P

EARTH PLANETS AND SPACE 57 巻 ( 5 ) 頁： 385 - 392 2005年

Transition region of TEC enhancement phenomena during geomagnetically disturbed periods at mid-latitudes 査読有り

Unnikrishnan, K; Saito, A; Otsuka, Y; Yamamoto, M; Fukao, S

ANNALES GEOPHYSICAE 23 巻 ( 11 ) 頁： 3439 - 3450 2005年

The first coordinated observations of mid-latitude E-region quasi-periodic radar echoes and lower thermospheric 557.7-nm airglow 査読有り

Ogawa T, Otsuka Y, Onoma F, Shiokawa K, Yamamoto M

ANNALES GEOPHYSICAE 23 巻 ( 7 ) 頁： 2391 - 2399 2005年

Spatial relationship of equatorial plasma bubbles and field-aligned irregularities observed with an all-sky airglow imager and the Equatorial Atmosphere Radar 査読有り

Otsuka, Y; Shiokawa, K; Ogawa, T; Yokoyama, T; Yamamoto, M; Fukao, S

GEOPHYSICAL RESEARCH LETTERS 31 巻 ( 20 ) 2004年10月

Statistical characteristics of gravity waves observed by an all-sky imager at Darwin, Australia 査読有り

Suzuki, S; Shiokawa, K; Otsuka, Y; Ogawa, T; Wilkinson, P

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 109 巻 ( D20 ) 頁： D20 - S07 2004年8月

Geomagnetic conjugate observations of medium-scale traveling ionospheric disturbances at midlatitude using all-sky airglow imagers 査読有り

Otsuka, Y; Shiokawa, K; Ogawa, T; Wilkinson, P

GEOPHYSICAL RESEARCH LETTERS 31 巻 ( 15 ) 2004年8月

Comparison of OH rotational temperatures measured by the spectral airglow temperature imager (SATI) and by a tilting-filter photometer 査読有り

Shiokawa, K; Otsuka, Y; Ogawa, T; Takahashi, H; Nakamura, T; Shimomai, T

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 66 巻 ( 11 ) 頁： 891 - 897 2004年7月

A statistical study of large-scale traveling ionospheric disturbances using the GPS network in Japan 査読有り

Tsugawa, T; Saito, A; Otsuka, Y

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 109 巻 ( A6 ) 頁： A06302 2004年6月

Simultaneous mesosphere/lower thermosphere and thermospheric F region observations during geomagnetic storms 査読有り

Balan N, Kawamura S, Nakamura T, Yamamoto M, Fukao S, Igarashi K, Maruyama T, Shiokawa K, Otsuka Y, Ogawa T, Alleyne H, Watanabe S, Murayama Y

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 109 巻 ( A4 ) 2004年4月

Spatial relationship of equatorial plasma bubbles and field-aligned irregularities observed with an all-sky airglow imager and the Equatorial Atmosphere Radar 査読有り

Otsuka, Y., K. Shiokawa, T. Ogawa, T. Yokoyama, M. Yamamoto, and S. Fukao

Geophys. Res. Lett. 31 巻 ( L20802 ) 頁： 10.1029/2004GL020869 2004年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We report, for the first time, simultaneous two-dimensional observations of 630-nm airglow depletions and radar backscatter from field-aligned irregularities (FAI) associated with equatorial plasma bubbles. Spatial distributions of backscatter were obtained by performing
east-west scans with the 47-MHz Equatorial Atmosphere Radar (EAR) in West Sumatra, Indonesia. A 630-nm airglow depletion, caused by a plasma bubble, was simultaneously
observed with an all-sky airglow imager.
Both the airglow depletion and backscatter region appeared as band-like structure elongated in the meridional direction with a zonal width of about 100 km. To compare the spatial structures of backscatter with that of airglow depletion,
the backscatter was projected onto a horizontal plane at 250-km altitude. Backscatter was found to occur within the entire airglow-depleted region.

*Geomagnetic conjugate observations of medium-scale traveling ionospheric disturbances at midlatitude using all-sky airglow imagers 査読有り

Otsuka, Y., K. Shiokawa, T. Ogawa, and P. Wilkinson

Geophys. Res. Lett. 31 巻 ( L15803 ) 頁： doi:10.1029/2004GL020262 2004年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We report for the first time simultaneous observations of medium-scale traveling ionospheric disturbances (MSTIDs) at geomagnetic conjugate points in both hemispheres, using two all-sky airglow imagers at midlatitudes. A 630-nm all-sky CCD imager at Sata, Japan, detected MSTIDs with a wavefront elongated from NW to SE on the night of August 9, 2002. During this event, MSTIDs with a wavefront elongated from SW to NE were observed at the geomagnetic conjugate point, Darwin, Australia. The MSTID structures mapped from Darwin to its magnetic conjugate points along the geomagnetic field lines B coincide closely with those in the Sata images. This result suggests that polarization electric field (Ep) plays an important role in the generation of MSTIDs. Ep maps along B and moves the F region plasma upward or downward by ExB drifts, causing plasma density perturbations with structures mirrored in the northern and southern hemispheres.

Generation of large-scale equatorial F-region plasma depletions during low range spread-F season 査読有り

Sahai, Y; Fagundes, PR; Abalde, JR; Pimenta, AA; Bittencourt, JA; Otsuka, Y; Rios, VH

ANNALES GEOPHYSICAE 22 巻 ( 1 ) 頁： 15 - 23 2004年

Time evolution of high-altitude plasma bubbles imaged at geomagnetic conjugate points 査読有り

Shiokawa, K; Otsuka, Y; Ogawa, T; Wilkinson, P

ANNALES GEOPHYSICAE 22 巻 ( 9 ) 頁： 3137 - 3143 2004年

Ray-tracing Calculation of VHF Radio Waves Scattered by Field-aligned Irregularities Associated with Equatorial Plasma Bubbles 査読有り

Hiroyuki Nakata, Yoshiaki Akaike, Yuichi Otsuka, Toshiaki Takano, Satoshi Ujigawa, Ikuo Nagashima

IEEJ Transactions on Fundamentals and Materials 124 巻 ( 12 ) 頁： 1253 - 1254 2004年

記述言語：英語掲載種別：研究論文（学術雑誌）

In order to explain the propagation of VHF radio waves for TV broadcasting transmitted from Southeast Asia associated with equatorial plasma bubbles, we have examined ray paths of the radio waves scattered by field-aligned irregularities in equatorial plasma bubbles. In determining the ray paths of the radio waves, a ray tracing calculation combined with a model of the scattering by field-aligned irregularities is used. It is found that VHF radio waves transmitted from Philippines can propagate to Japan due to scattering by field-aligned irregularities located above the East China Sea. © 2004, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejfms.124.1253

Scopus

Thermospheric wind during a storm-time large-scale traveling ionospheric disturbance 査読有り

Shiokawa, K; Otsuka, Y; Ogawa, T; Kawamura, S; Yamamoto, M; Fukao, S; Nakamura, T; Tsuda, T; Balan, N; Igarashi, K; Lu, G; Saito, A; Yumoto, K

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 108 巻 ( A12 ) 2003年12月

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