研究者詳細 - 大塚　雄一

論文 - 大塚　雄一

分割表示 484 件中 201 - 220 件目／全件表示 >>

Discovery of 1Hz Range Modulation of Isolated Proton Aurora at Subauroral Latitudes 査読有り

Ozaki, M; Shiokawa, K; Miyoshi, Y; Kataoka, R; Connors, M; Inoue, T; Yagitani, S; Ebihara, Y; Jun, CW; Nomura, R; Sakaguchi, K; Otsuka, Y; Uchida, HA; Schofield, I; Danskin, DW

GEOPHYSICAL RESEARCH LETTERS 45 巻 ( 3 ) 頁： 1209 - 1217 2018年2月

Observations of Ultrawideband Signals in GPS TEC Variations over Europe during Solar Eclipse 査読有り

Panasenko Sergii V, Chernogor Leonid F, Lazorenko Oleg V, Otsuka Yuichi, van de Kamp Max

2018 9TH INTERNATIONAL CONFERENCE ON ULTRAWIDEBAND AND ULTRASHORT IMPULSE SIGNALS (UWBUSIS) 頁： 115 - 118 2018年

Temporal and spatial variations of mid-latitude ionospheric trough during a geomagnetic storm based on global GNSS-TEC and Arase satellite observations 査読有り

2018 2ND URSI ATLANTIC RADIO SCIENCE MEETING (AT-RASC) 2018年

First Study on the Occurrence Frequency of Equatorial Plasma Bubbles over West Africa Using an All-Sky Airglow Imager and GNSS Receivers 査読有り

Okoh, D; Rabiu, B; Shiokawa, K; Otsuka, Y; Segun, B; Falayi, E; Onwuneme, S; Kaka, R

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 12 ) 頁： 12430 - 12444 2017年12月

Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network 査読有り

Shiokawa, K; Katoh, Y; Hamaguchi, Y; Yamamoto, Y; Adachi, T; Ozaki, M; Oyama, SI; Nosé, M; Nagatsuma, T; Tanaka, Y; Otsuka, Y; Miyoshi, Y; Kataoka, R; Takagi, Y; Takeshita, Y; Shinbori, A; Kurita, S; Hori, T; Nishitani, N; Shinohara, I; Tsuchiya, F; Obana, Y; Suzuki, S; Takahashi, N; Seki, K; Kadokura, A; Hosokawa, K; Ogawa, Y; Connors, M; Ruohoniemi, JM; Engebretson, M; Turunen, E; Ulich, T; Manninen, J; Raita, T; Kero, A; Oksanen, A; Back, M; Kauristie, K; Mattanen, J; Baishev, D; Kurkin, V; Oinats, A; Pashinin, A; Vasilyev, R; Rakhmatulin, R; Bristow, W; Karjala, M

EARTH PLANETS AND SPACE 69 巻 2017年11月

The Solar Flux Dependence of Ionospheric 150 km Radar Echoes and Implications 査読有り

Patra, AK; Chaitanya, PP; St-Maurice, JP; Otsuka, Y; Yokoyama, T; Yamamoto, M

GEOPHYSICAL RESEARCH LETTERS 44 巻 ( 22 ) 頁： 11257 - 11264 2017年11月

On the effect of thermospheric neutral winds on post-midnight field-aligned irregularities at low latitudes 査読有り

Tam Dao, Yuichi Otsuka, Kazuo Shiokawa, Michi Nishioka, Mamoru Yamamoto, Suhaila M. Buhari, Mardina Abdullah, Asnawi Husin

2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017 2017- 巻頁： 1 - 4 2017年11月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

We investigated a post-midnight Field-Aligned Irregularities (FAIs) event observed with the Equatorial Atmosphere Radar (EAR) at Kototabang (0.2°S, 100.3°E, dip lat. 10.4°S) in Indonesia on the night of 9 July 2010, using a comprehensive dataset of both neutral and plasma parameters. We compared FAI echoes collocated with 630 nm airglow depletion detected by an all-sky imager. The thermospheric neutral winds and temperatures obtained by a Fabry-Perot interferometer at Kototabang and the altitudes of F-layer (h'F) observed with ionosondes at Kototabang, Chiang Mai, and Chumphon were also examined. We found that the 3-m scale post-midnight FAIs occurred within plasma bubbles. The convergence of the equatorward neutral winds happened in this particular event related to midnight temperature maximum (MTM) and that the equatorward winds in both northern and southern hemispheres could be responsible for the growth of plasma bubbles around midnight. The uplift of F-layer at low latitudes could increase the growth rate of the Rayleigh-Taylor instability. Eastward electric currents driven by the equatorward winds could also contribute to the generation of the irregularities at post-midnight.

DOI： 10.23919/URSIGASS.2017.8105106

Web of Science

Scopus

Geomagnetically conjugate observations of ionospheric and thermospheric variations accompanied by a midnight brightness wave at low latitudes (vol 69, 112, 2017) 査読有り

Fukushima, D; Shiokawa, K; Otsuka, Y; Kubota, M; Yokoyama, T; Nishioka, M; Komonjinda, S; Yatini, CY

EARTH PLANETS AND SPACE 69 巻 2017年11月

Characteristics of Seasonal Variation and Solar Activity Dependence of the Geomagnetic Solar Quiet Daily Variation 査読有り

Shinbori, A; Koyama, Y; Nosé, M; Hori, T; Otsuka, Y

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 10 ) 頁： 10796 - 10810 2017年10月

Geomagnetically conjugate observations of ionospheric and thermospheric variations accompanied by a midnight brightness wave at low latitudes 査読有り

Fukushima, D; Shiokawa, K; Otsuka, Y; Kubota, M; Yokoyama, T; Nishioka, M; Komonjinda, S; Yatini, CY

EARTH PLANETS AND SPACE 69 巻 2017年8月

Daytime zonal drifts in the ionospheric 150km and E regions estimated using EAR observations 査読有り

Pavan Chaitanya P., Patra A. K., Otsuka Y., Yokoyama T., Yamamoto M., Stoneback R. A., Heelis R. A.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 8 ) 頁： 9045 - 9055 2017年8月

Sixteen year variation of horizontal phase velocity and propagation direction of mesospheric and thermospheric waves in airglow images at Shigaraki, Japan 査読有り

Takeo, D; Shiokawa, K; Fujinami, H; Otsuka, Y; Matsuda, TS; Ejiri, MK; Nakamura, T; Yamamoto, M

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 8 ) 頁： 8770 - 8780 2017年8月

Equinoctial asymmetry in the zonal distribution of scintillation as observed by GPS receivers in Indonesia 査読有り

Abadi, P; Otsuka, Y; Shiokawa, K; Husin, A; Liu, HX; Saito, S

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 8 ) 頁： 8947 - 8958 2017年8月

Sixteen-year variation of horizontal phase velocity and propagation direction of mesospheric and thermospheric waves in airglow images at Shigaraki 査読有り

Takeo, D, K. Shiokawa, H. Fujinami, Y. Otsuka, T. S. Matsuda, M. K. Ejiri, T. Nakamura, M. Yamamoto

Journal of Geophysical Research -Atmospheres 122 巻頁： 8770-8780 2017年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

We analyzed the horizontal phase velocity of gravity waves and medium-scale traveling ionospheric disturbances (MSTIDs) by using the three-dimensional fast Fourier transform method developed by Matsuda et al. (2014) for 557.7 nm (altitude: 90–100 km) and 630.0 nm (altitude: 200–300 km) airglow images obtained at Shigaraki MU Observatory (34.8°N, 136.1°E, dip angle: 49°) over ∼16 years from 16 March 1999 to 20 February 2015. The analysis of 557.7 nm airglow images shows clear seasonal variation of the propagation direction of gravity waves in the mesopause region. In spring, summer, fall, and winter, the peak directions are northeastward, northeastward, northwestward, and southwestward, respectively. The difference in east-west propagation direction between summer and winter is probably caused by the wind filtering effect due to the zonal mesospheric jet. Comparison with tropospheric reanalysis data shows that the difference in north-south propagation direction between summer and winter is caused by differences in the latitudinal location of wave sources due to convective activity in the troposphere relative to Shigaraki. The analysis of 630.0 nm airglow images shows that t

DOI： 10.0002/2017JA023919

Coordinated observations of postmidnight irregularities and thermospheric neutral winds and temperatures at low latitudes 査読有り

Dao, T; Otsuka, Y; Shiokawa, K; Nishioka, M; Yamamoto, M; Buhari, SM; Abdullah, M; Husin, A

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 7 ) 頁： 7504 - 7518 2017年7月

Detection of Plasma Bubble in Ionosphere using GPS Receivers in Southeast Asia 査読有り

Buhari, SM; Abdullah, M; Otsuka, Y; Yokoyama, T; Nishioka, M; Hasbi, AM; Tsugawa, T

SAINS MALAYSIANA 46 巻 ( 6 ) 頁： 879 - 885 2017年6月

Measurement of thermospheric temperatures using OMTI Fabry-Perot interferometers with 70-mm etalon 査読有り

Nakamura, Y; Shiokawa, K; Otsuka, Y; Oyama, S; Nozawa, S; Komolmis, T; Komonjida, S; Neudegg, D; Yuile, C; Meriwether, J; Shinagawa, H; Jin, H

EARTH PLANETS AND SPACE 69 巻 2017年4月

Large-scale traveling ionospheric disturbances observed by GPS dTEC maps over North and South America on Saint Patrick's Day storm in 2015 査読有り

Figueiredo, CAOB; Wrasse, CM; Takahashi, H; Otsuka, Y; Shiokawa, K; Barros, D

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 4 ) 頁： 4755 - 4763 2017年4月

Climatology of successive equatorial plasma bubbles observed by GPS ROTI over Malaysia 査読有り

Buhari, SM; Abdullah, M; Yokoyama, T; Otsuka, Y; Nishioka, M; Hasbi, AM; Bahari, SA; Tsugawa, T

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 2 ) 頁： 2174 - 2184 2017年2月

STATISTICAL ANALYSIS OF THE OCCURRENCES OF MSTIDs OBSERVED BY ALL-SKY IMAGER IN LOW MAGNETIC LATITUDE 査読有り

2017 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS) 頁： 4425 - 4428 2017年

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