Faculty Profiles - OTSUKA, Yuichi

Papers - OTSUKA, Yuichi

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Was the Unseasonal Development of Post-Sunset Equatorial Plasma Bubbles in Southeast Asia Driven by Quasi-2-Day Planetary Waves?

Dai, GF; Li, GZ; Otsuka, Y; Hu, LH; Sun, WJ; Ning, BQ; Zhang, DH; Lei, JH; Xie, HY; Zhao, XK; Nishioka, M; Perwitasari, S; Jamjareegulgarn, P; Li, Y; Yan, CX

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 130 ( 3 ) 2025.3

Thank You to Our 2024 Reviewers

Karnauskas, K; Aiyyer, A; Camargo, S; Capitanio, F; Feakins, S; Fulweiler, R; Ganju, N; Giannini, A; Gu, Y; Huber, C; Ivanov, V; Korte, M; Kumar, S; Lewis, K; Magnusdottir, G; Morlighem, M; Otsuka, Y; Prieto, GA; Qiu, B; Russell, L; Seki, K; Su, H; Sun, DY; Viswanathan, H; Wang, GL; Wang, KC; White, AE; Williams, Q; Zhang, L

GEOPHYSICAL RESEARCH LETTERS Vol. 52 ( 4 ) 2025.2

Medium-scale traveling ionospheric disturbances created by primary gravity waves generated by a winter storm

Kogure, M; Chou, MY; Yue, J; Otsuka, Y; Liu, HX; Sassi, F; Pedatella, N; Randall, CE; Harvey, VL

JOURNAL OF SPACE WEATHER AND SPACE CLIMATE Vol. 14 2024.12

Machine learning approach for ionospheric scintillation prediction on ROTI parameter over the African region during solar cycle 24

Tete, S; Otsuka, Y; Zahra, WK; Mahrous, A

ADVANCES IN SPACE RESEARCH Vol. 74 ( 12 ) page： 6325 - 6342 2024.12

X-Raying Neutral Density Disturbances in the Mesosphere and Lower Thermosphere Induced by the 2022 Hunga-Tonga Volcano Eruption-Explosion

Katsuda, S; Shinagawa, H; Fujiwara, H; Jin, HDKT; Miyoshi, Y; Miyoshi, Y; Motizuki, Y; Nakajima, M; Nakazawa, K; Nobukawa, KK; Otsuka, Y; Shinbori, A; Sori, T; Tao, CHR; Tashiro, MS; Wada, Y; Yamawaki, T

GEOPHYSICAL RESEARCH LETTERS Vol. 51 ( 20 ) 2024.10

Longitudinal Range of the Eastward-Traveling Equatorial Plasma Bubble Inducing Ionospheric Scintillation Reviewed

Abadi, P; Otsuka, Y; Saito, S; Yamamoto, M; Perwitasari, S; Muafiry, IN; Putra, AY; Faturahman, A

SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS Vol. 22 ( 8 ) 2024.8

High-resolution 3-D imaging of electron density perturbations using ultra-dense GNSS observation networks in Japan: an example of medium-scale traveling ionospheric disturbances Reviewed International coauthorship

Fu, WZ; Otsuka, Y; Ssessanga, N

EARTH PLANETS AND SPACE Vol. 76 ( 1 ) 2024.7

Leveraging machine learning techniques and GPS measurements for precise TEC rate predictions Reviewed International coauthorship

Tete, S; Otsuka, Y; Zahra, WK; Mahrous, A

GPS SOLUTIONS Vol. 28 ( 3 ) 2024.7

Thank You to Our 2023 Peer Reviewers Reviewed International coauthorship

Rajaram, H; Aiyyer, A; Camargo, S; Cappa, CD; Dombard, AJ; Donohue, KA; Feakins, S; Flesch, L; Fulweiler, R; Ganju, N; Giannini, A; Gu, Y; Huber, C; Ivanov, V; Karnauskas, K; Korte, M; Lewis, K; Lu, G; Magnusdottir, G; Morlighem, M; Oieroset, M; Otsuka, Y; Prieto, GA; Qiu, B; Russell, L; Su, H; Sun, DY; Wang, GL; Wang, KC; Whalen, C; White, AE; Williams, Q; Yau, A

GEOPHYSICAL RESEARCH LETTERS Vol. 51 ( 9 ) 2024.5

Permulaan Gelembung Plasma Khatulistiwa Semasa Angin Neutral Kuat dan Lemah di Asia Tenggara

Sarudin, I; Hamid, NSA; Abdullah, M; Buhari, SM; Otsuka, Y; Perwitasari, S; Yatini, C

JURNAL KEJURUTERAAN Vol. 36 ( 3 ) page： 1281 - 1289 2024.5

Assessing the potential of ionosonde for forecasting post-sunset equatorial spread F: an observational experiment in Southeast Asia Reviewed International coauthorship

Abadi, P; Ahmad, UA; Otsuka, Y; Jamjareegulgarn, P; Almahi, A; Perwitasari, S; Supriadi, S; Harjupa, W; Septiawan, RR

EARTH PLANETS AND SPACE Vol. 75 ( 1 ) 2023.12

Equinoctial asymmetry of plasma bubble occurrence and electric field at evening: GPS and ionosonde measurements in Southeast Asia Reviewed

Otsuka, Y; Abadi, P; Hozumi, K; Almahi, A

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS Vol. 252 2023.11

Daytime Medium Scale Traveling Ionospheric Disturbances (MSTIDS) Over the Andes Mountains at Equatorial and Low Magnetic Latitudes Reviewed International coauthorship

Figueiredo, CAOB; Wrasse, CM; Vadas, S; Takahashi, H; Otsuka, Y; Nyassor, PK; Shiokawa, K; Paulino, I; Barros, D

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 128 ( 10 ) 2023.10

Responses of the African-European equatorial-, low-, mid-, and high-latitude ionosphere to geomagnetic storms of 2013, 2015 St Patrick's Days, 1 June 2013, and 7 October 2015 Reviewed International coauthorship

Vol. 72 ( 3 ) page： 775 - 789 2023.8

Equatorial plasma bubble intensities across longitudinal sectors of the globe using GNSS observations Reviewed International coauthorship

Vol. 249 2023.8

Ionospheric disturbances over South America related to Tonga volcanic eruption Reviewed International coauthorship

Vol. 75 ( 1 ) 2023.5

Generation of equatorial plasma bubble after the 2022 Tonga volcanic eruption Reviewed

A. Shinbori, T. Sori, Y. Otsuka, M. Nishioka, S. Perwitasari, T. T. Tsuda, A. Kumamoto, F. Tsuchiya, S. Matsuda, Y. Kasahara, A. Matsuoka, S. Nakamura, Y. Miyoshi, I. Shinohara

Sci. Rep. Vol. 13 ( 1 ) page： 6450 2023.5

Language：English Publishing type：Research paper (scientific journal)

Equatorial plasma bubbles are a phenomenon of plasma density depletion with small-scale density irregularities, normally observed in the equatorial ionosphere. This phenomenon, which impacts satellite-based communications, was observed in the Asia-Pacific region after the largest-on-record January 15, 2022 eruption of the Tonga volcano. We used satellite and ground-based ionospheric observations to demonstrate that an air pressure wave triggered by the Tonga volcanic eruption could cause the emergence of an equatorial plasma bubble. The most prominent observation result shows a sudden increase of electron density and height of the ionosphere several ten minutes to hours before the initial arrival of the air pressure wave in the lower atmosphere. The propagation speed of ionospheric electron density variations was ~ 480–540 m/s, whose speed was higher than that of a Lamb wave (~315 m/s) in the troposphere. The electron density variations started larger in the Northern Hemisphere than in the Southern Hemisphere. The fast response of the ionosphere could be caused by an instantaneous transmission of the electric field to the magnetic conjugate ionosphere along the magnetic field lines. After the ionospheric perturbations, electron density depletion appeared in the equatorial and low-latitude ionosphere and extended at least up to ±25° in geomagnetic latitude.

DOI： 10.1038/s41598-023-33603-3

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Scopus

PubMed

Day-to-day variability of the equatorial ionosphere in Asian sector during August-October 2019 Reviewed International coauthorship

Vol. 10 2023.5

Multi-Event Conjugate Measurements of the SAR Arc Detachment From the Auroral Oval Using DMSP Satellites and an All-Sky Camera at Athabasca, Canada Reviewed International coauthorship

Vol. 128 ( 4 ) 2023.4

Solved and unsolved riddles about low-latitude daytime valley region plasma waves and 150-km echoes Reviewed International coauthorship

Vol. 10 2023.2

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Papers - OTSUKA, Yuichi