Faculty Profiles - OTSUKA, Yuichi

Papers - OTSUKA, Yuichi

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Multiple-Event Study of Substorm Electric Field Penetration Into Middle Latitudes Based on Simultaneous Observation of 630-nm Airglow Enhancements at Three Stations

Morita, S; Shiokawa, K; Otsuka, Y; Nshitani, N; Shinbori, A; Fujimoto, A; Yoshikawa, A; Nishioka, M; Perwitasari, S; Yamamoto, M; Sori, T

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 130 ( 10 ) 2025.10

Post-Sunrise Ionospheric Irregularities in Southeast Asia During the Geomagnetic Storm on 19-20 April 2024

Abadi, P; Muafiry, IN; Pratama, TN; Putra, AY; Faturahman, A; Noersomadi; Maryadi, E; Chabibi, FF; Ahmad, UA; Li, GZ; Sun, WJ; Xie, HY; Otsuka, Y; Perwitasari, S; Jamjareegulgran, P

REMOTE SENSING Vol. 17 ( 16 ) 2025.8

High-Resolution GNSS Tomography of Storm-Enhanced Density and Embedded Depletions Over Japan During the May 2024 Super Geomagnetic Storm

Fu, WZ; Otsuka, Y; Ssessanga, N; Yokoyama, T; Yamamoto, M

GEOPHYSICAL RESEARCH LETTERS Vol. 52 ( 16 ) 2025.8

Reduction of High Latitude Ionospheric Electron Density by the Impact of Negative Solar Wind Pressure Pulse During the Geomagnetic Storm of 23 March 2023

Kakoti, G; Bagiya, MS; Vichare, G; Shiokawa, K; Shreedevi, PR; Nishitani, N; Otsuka, Y; Shinbori, A; Nishioka, M; Perwitasari, S

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 130 ( 8 ) 2025.8

On the fresh development of midnight plasma bubbles over South America

Vital, LFR; Xu, JY; Otsuka, Y; Ayorinde, TT; Takahashi, H; Barros, D; Carmo, C; Figueiredo, CAOB; Wrasse, CM; Lima, LM; Paulino, I; Wang, C; Li, H; Liu, ZK

EARTH PLANETS AND SPACE Vol. 77 ( 1 ) 2025.8

Characteristics of Nighttime Medium-Scale Traveling Ionospheric Disturbances: Longitudinal Comparison of Their Seasonal and Local Time Variations

Katamzi-Joseph, ZT; Habarulema, JB; Otsuka, Y; Matamba, TM; Nel, AE

SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS Vol. 23 ( 7 ) 2025.7

Causal links to persisting daytime equatorial plasma bubbles over Asia-Pacific region following the geomagnetic storm on 01 December 2023

Rajesh, PK; Lin, CHC; Otsuka, Y; Yamamoto, M; Chen, SP; Lin, CY; Matsuo, T; Nishioka, M; Perwitasari, S; Jin, H; Choi, JM

SCIENTIFIC REPORTS Vol. 15 ( 1 ) 2025.7

Asymmetric Ionospheric Disturbances Observed by GNSS During the 2017 Typhoon Talim and Doksuri: Origin and Characteristics

Fu, JX; Otsuka, Y; Jin, H

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 130 ( 7 ) 2025.7

Identifying medium-scale traveling ionospheric disturbances driven by atmospheric gravity waves over Japan at sunrise and sunset terminators using high-resolution 3-D GNSS tomography

Fu, WZ; Otsuka, Y; Hocke, K; Ma, GY; Nishioka, M; Jin, H

GPS SOLUTIONS Vol. 29 ( 3 ) 2025.7

A Bootstrapping Convolutional Neural Network Technique for Optimizing Automated Detection of Equatorial Plasma Bubbles by Optical All-Sky Imagers

Okoh, D; Cesaroni, C; Rabiu, B; Shiokawa, K; Otsuka, Y; Ogunjo, S; Akerele, A; Habarulema, JB; Nava, B; Migoya-Orué, Y; Jamjareegulgarn, P; Seun, A; Adama, O; Ochieng, G; Ameh, J; Awuor, A; Baki, P

EARTH AND SPACE SCIENCE Vol. 12 ( 6 ) 2025.6

On the Extraordinary L-Band Scintillation Event Observed in the American Sector During the 23-24 March 2023 Geomagnetic Storm

Socola, JG; Rodrigues, FS; Sousasantos, J; Quesada, MR; Heelis, R; Otsuka, Y; Shinbori, A; Nishioka, M; Perwitasari, S

SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS Vol. 23 ( 6 ) 2025.6

Strong ionospheric activity at the MWA site associated with plasma bubble measured by GNSS

Yoshiura, S; Otsuka, Y; Trott, CM; Null, D; Nishitani, N; Takahashi, K; Nishioka, M; Perwitasari, S; Shinbori, A

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN Vol. 77 ( 3 ) page： 556 - 561 2025.6

Unveiling the vertical ionospheric responses following the 2024 Noto Peninsula Earthquake with an ultra-dense GNSS network

Fu, WZ; Otsuka, Y; Ssessanga, N; Shinbori, A; Sori, T; Nishioka, M; Perwitasari, S

EARTH PLANETS AND SPACE Vol. 77 ( 1 ) 2025.5

Investigation into the earliest generation of medium-scale traveling ionospheric disturbances with electrodynamic signatures using dense GNSS observations over Japan

Fu, WZ; Otsuka, Y; Yokoyama, T; Li, ZZ; Yamamoto, M; Nishioka, M; Jin, H; Hosokawa, K; Stolle, C

EARTH PLANETS AND SPACE Vol. 77 ( 1 ) 2025.5

A Peculiar Discontinuous Ionospheric Latitudinal Variation Over the East Asia Region During the Recovery Phase of the November 2003 Super Magnetic Storm: A Hint From May 2024 Superstorm

Guo, X; Zhao, BQ; Yu, TT; Zhang, YL; Otsuka, Y; Shinbori, A; Nishioka, M; Perwitasari, S; Sun, WJ; Hu, LH; Li, GZ; Ren, ZP

GEOPHYSICAL RESEARCH LETTERS Vol. 52 ( 9 ) 2025.5

Advanced detection methods and machine learning analysis of temporal and spatial patterns of equatorial plasma bubble depth

Adawa, I; Otsuka, Y; Abdelwahab, M; Mahrous, A

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS Vol. 270 2025.5

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

Responses of the Daytime Low and Equatorial Ionosphere and Thermosphere Over the Indian Region During the Geomagnetic Storm of April 2023

Krishnan, LG; Shiokawa, K; Pant, TK; Lu, G; Shreedevi, PR; Otsuka, Y; Sunda, S

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

Thank You to Our 2024 Reviewers Open Access

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 Open Access

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

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Papers - OTSUKA, Yuichi