研究者詳細 - 大塚　雄一

論文 - 大塚　雄一

分割表示 496 件中 201 - 220 件目／全件表示 >>

On the Role of Thermospheric Winds and Sporadic E Layers in the Formation and Evolution of Electrified MSTIDs in Geomagnetic Conjugate Regions 査読有り Open Access

Narayanan V. L., Shiokawa K., Otsuka Y., Neudegg D.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123 巻 ( 8 ) 頁： 6957 - 6980 2018年8月

Statistical Analysis of the Phase Velocity Distribution of Mesospheric and Ionospheric Waves Observed in Airglow Images Over a 16-Year Period: Comparison Between Rikubetsu and Shigaraki, Japan 査読有り Open Access

Tsuchiya, S; Shiokawa, K; Fujinami, H; Otsuka, Y; Nakamura, T; Yamamoto, M

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123 巻 ( 8 ) 頁： 6930 - 6947 2018年8月

On the Solstice Maxima and Azimuth-Dependent Characteristics of the 150-km Echoes Observed Using the Equatorial Atmosphere Radar 査読有り

Chaitanya, PP; Patra, AK; Otsuka, Y; Yokoyama, T; Yamamoto, M

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123 巻 ( 8 ) 頁： 6752 - 6759 2018年8月

Quantum criticality in the metal-superconductor transition of interacting Dirac fermions on a triangular lattice 査読有り Open Access

Otsuka Yuichi, Seki Kazuhiro, Sorella Sandro, Yunoki Seiji

PHYSICAL REVIEW B 98 巻 ( 3 ) 2018年7月

Equatorial plasma bubble seeding by MSTIDs in the ionosphere 査読有り Open Access

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

PROGRESS IN EARTH AND PLANETARY SCIENCE 5 巻 ( 1 ) 2018年6月

Total Electron Content Observations by Dense Regional and Worldwide International Networks of GNSS

Tsugawa Takuya, Nishioka Michi, Ishii Mamoru, Hozumi Kornyanat, Saito Susumu, Shinbori Atsuki, Otsuka Yuichi, Saito Akinori, Buhari Suhaila M., Abdullah Mardina, Supnithi Pornchai

JOURNAL OF DISASTER RESEARCH 13 巻 ( 3 ) 頁： 535-545 2018年6月

Total Electron Content Observations by Dense Regional and Worldwide International Networks of GNSS 査読有り

Tsugawa Takuya, Nishioka Michi, Ishii Mamoru, Hozumi Kornyanat, Saito Susumu, Shinbori Atsuki, Otsuka Yuichi, Saito Akinori, Buhari Suhaila M, Abdullah Mardina, Supnithi Pornchai

JOURNAL OF DISASTER RESEARCH 13 巻 ( 3 ) 頁： 535 - 545 2018年6月

Relationship between day-to-day variability of equatorial plasma bubble activity from GPS scintillation and atmospheric properties from Ground-to-topside model of Atmosphere and Ionosphere for Aeronomy (GAIA) assimilation 査読有り Open Access

Yamamoto, M; Otsuka, Y; Jin, H; Miyoshi, Y

PROGRESS IN EARTH AND PLANETARY SCIENCE 5 巻 2018年5月

Spatial and temporal characteristics of ionospheric total electron content over Indian equatorial and low-latitude GNSS stations 査読有り

G. Sivavaraprasad, Yuichi Otsuka, Nitin Kumar Tripathi, V Rajesh Chowdhary, D Venkata Ratnam, Mohammed Afzal Khan

2018 Conference on Signal Processing And Communication Engineering Systems, SPACES 2018 2018- 巻頁： 105 - 108 2018年3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.

The study and understanding of the intermittent characteristics of equatorial and low latitude ionosphere is crucial for modelling and forecasting the ionosphere and space weather conditions. The performance of space-based navigation systems such as Global Positioning System (GPS) is affected by the sporadic temporal and spatial variations of ionospheric Total Electron Content (TEC). The variability of ionospheric electron density over Indian low latitude sector is difficult to model due to Equatorial Ionization Anomaly (EIA). In this paper, Multi-fractal aspects of the GPS measured TEC is investigated during both high and low solar activity periods of 24th solar cycle. The vertical TEC (VTEC) data sets are obtained from two Indian low latitude stations namely, Bangalore (Geographical Latitude: 13.020 N, Geographical Longitude: 77.57o E), and Lucknow (Geographical Latitude: 26.830 N, Geographical Longitude: 80.92o E) for two year long period 2013 and 2015. The experimental results shows that the respective geographic sites have important scaling differences as well as similarities when their Multi-fractal signatures for VTEC are compared. These differences and similarities are interpreted in terms of the EIA conditions, where this phenomenon is an important source of intermittence due to the presence of the VTEC peaks at ±300 geomagnetic latitudes. During the high solar activity period, the intermittence characteristics of VTEC over EIA region (Lucknow) are relatively more complex than equatorial (Bengaluru) station, whereas during low solar activity period the scenario is reciprocal.

DOI： 10.1109/SPACES.2018.8316326

Web of Science

Scopus

Daily and seasonal variations in the linear growth rate of the Rayleigh-Taylor instability in the ionosphere obtained with GAIA 査読有り Open Access

Shinagawa, H; Jin, H; Miyoshi, Y; Fujiwara, H; Yokoyama, T; Otsuka, Y

PROGRESS IN EARTH AND PLANETARY SCIENCE 5 巻 2018年3月

Medium-Scale Traveling Ionospheric Disturbances Observed by Detrended Total Electron Content Maps Over Brazil 査読有り Open Access

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

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123 巻 ( 3 ) 頁： 2215 - 2227 2018年3月

Daytime F-region irregularity triggered by rocket-induced ionospheric hole over low latitude 査読有り Open Access

Li, GZ; Ning, BQ; Abdu, MA; Wang, C; Otsuka, Y; Wan, WX; Lei, JH; Nishioka, M; Tsugawa, T; Hu, LH; Yang, GT; Yan, CX

PROGRESS IN EARTH AND PLANETARY SCIENCE 5 巻 ( 1 ) 2018年2月

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

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 Open Access

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 Open Access

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 Open Access

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 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11月

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