研究者詳細 - 大塚　雄一

論文 - 大塚　雄一

分割表示 496 件中 221 - 240 件目／全件表示 >>

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 Open Access

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 Open Access

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 Open Access

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 Open Access

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

Open Access

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

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 Open Access

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 Open Access

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 Open Access

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 Open Access

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

The first long-term all-sky imager observation of lunar sodium tail 査読有り

Nishino, MN; Shiokawa, K; Otsuka, Y

ICARUS 280 巻頁： 199 - 204 2016年12月

Three years of concentric gravity wave variability in the mesopause as observed by IMAP/VISI 査読有り

Perwitasari, S; Sakanoi, T; Nakamura, T; Ejiri, MK; Tsutsumi, M; Tomikawa, Y; Otsuka, Y; Yamazaki, A; Saito, A

GEOPHYSICAL RESEARCH LETTERS 43 巻 ( 22 ) 頁： 11528 - 11535 2016年11月

Ionospheric TEC Weather Map Over South America 査読有り Open Access

Takahashi, H; Wrasse, CM; Denardini, CM; Pádua, MB; de Paula, ER; Costa, SMA; Otsuka, Y; Shiokawa, K; Monico, JFG; Ivo, A; Sant'Anna, N

SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS 14 巻 ( 11 ) 頁： 937 - 949 2016年11月

On the fresh development of equatorial plasma bubbles around the midnight hours of June solstice 査読有り

Ajith, KK; Ram, ST; Yamamoto, M; Otsuka, Y; Niranjan, K

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 121 巻 ( 9 ) 頁： 9051 - 9062 2016年9月

Fast modulations of pulsating proton aurora related to subpacket structures of Pc1 geomagnetic pulsations at subauroral latitudes 査読有り Open Access

Ozaki, M; Shiokawa, K; Miyoshi, Y; Kataoka, R; Yagitani, S; Inoue, T; Ebihara, Y; Jun, CW; Nomura, R; Sakaguchi, K; Otsuka, Y; Shoji, M; Schofield, I; Connors, M; Jordanova, VK

GEOPHYSICAL RESEARCH LETTERS 43 巻 ( 15 ) 頁： 7859 - 7866 2016年8月

Enhanced ionospheric plasma bubble generation in more active ITCZ 査読有り Open Access

Li, GZ; Otsuka, Y; Ning, BQ; Abdu, MA; Yamamoto, M; Wan, WX; Liu, LB; Abadi, P

GEOPHYSICAL RESEARCH LETTERS 43 巻 ( 6 ) 頁： 2389 - 2395 2016年3月

Altitude development of postmidnight F region field-aligned irregularities observed using Equatorial Atmosphere Radar in Indonesia 査読有り Open Access

Tam Dao, Otsuka Yuichi, Shiokawa Kazuo, Ram S. Tulasi, Yamamoto Mamoru

GEOPHYSICAL RESEARCH LETTERS 43 巻 ( 3 ) 頁： 1015 - 1022 2016年2月

Pulsating proton aurora caused by rising tone Pc1 waves 査読有り Open Access

Nomura, R; Shiokawa, K; Omura, Y; Ebihara, Y; Miyoshi, Y; Sakaguchi, K; Otsuka, Y; Connors, M

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 121 巻 ( 2 ) 頁： 1608 - 1618 2016年2月

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