Yuichi Otsuka 研究室

主宰者：Yuichi Otsuka

名古屋大学

AI 要約（直近 5 年の研究成果）

大気圏と電離圏（地球上空の電気を帯びた領域）の相互作用や、これらの層で生じる様々な波動現象を調査しています。研究の中心は、電離圏内で発生する周期的な波動構造や密度変動など、衛星通信やGPS測位に影響を与える現象を理解することです。また地磁気嵐時における電離圏の急激な変化や、台風などの大気の下層での現象が上空にどのように伝わるかというテーマにも取り組んでいます。研究手法として、地上に設置されたGPS受信機ネットワークから得られる電子密度データや、全天カメラによる光学観測、さらには複数の衛星搭載センサーからの遠隔観測データを活用しています。これらのマルチプルな観測手段を組み合わせることで、三次元的な立体画像構築（電離圏トモグラフィ）や機械学習を用いた自動検出など、最先端の解析技術を適用しています。主な発見として、従来は地球の異なる領域で独立した現象だと考えられていた現象が、実は大気下層から上層へと連続的に伝播する波動による結果であることが明らかになっています。これらの成果は、宇宙天気の予測精度向上や、衛星通信システムの信頼性向上に貢献する知見となっています。

※ AI（Claude）が、公開されている論文要旨から研究の問い・手法・主要な発見を事実情報として抽出・再構成して自動生成しています。誤りを含む可能性があるため、正確性は研究室公式情報でご確認ください。

外部リンク

研究成果（100 件）

[2026] Thank You to Our 2025 Peer Reviewers
DOI: https://doi.org/10.1029/2026gl122706
[2025] Simultaneous Observations of Quasi‐Orthogonal Nighttime MSTIDs at Conjugate African‐European Midlatitude Stations on 4 October 2018
DOI: https://doi.org/10.1029/2025ja034016
[2025] Storm-time hourly morphologies of Equatorial Ionization Anomaly (EIA) crests along 110–125°E meridian during 2013 St Patrick’s Day geomagnetic storm
DOI: https://doi.org/10.1016/j.asr.2025.11.068
[2025] Unusual Phase Alignment of Nighttime Electrified Medium‐Scale Traveling Ionospheric Disturbance After Moderate Geomagnetic Storms and Response to Substorms
DOI: https://doi.org/10.1029/2025gl116392
[2025] Multiple‐Event Study of Substorm Electric Field Penetration Into Middle Latitudes Based on Simultaneous Observation of 630‐nm Airglow Enhancements at Three Stations
DOI: https://doi.org/10.1029/2025ja033721
[2025] Medium‐Scale Traveling Ionospheric Disturbances Observed by Nadir‐Viewing 630 nm Airglow Imaging From the International Space Station
DOI: https://doi.org/10.1029/2025ja034097
[2025] Post-Sunrise Ionospheric Irregularities in Southeast Asia During the Geomagnetic Storm on 19–20 April 2024
DOI: https://doi.org/10.3390/rs17162906
[2025] Global patterns of nighttime equatorial plasma depletion depth and longitudinal spread during low and moderate solar activity
DOI: https://doi.org/10.1016/j.asr.2025.08.011
[2025] Reduction of High Latitude Ionospheric Electron Density by the Impact of Negative Solar Wind Pressure Pulse During the Geomagnetic Storm of 23 March 2023
DOI: https://doi.org/10.1029/2025ja033939
[2025] Characteristics of Nighttime Medium‐Scale Traveling Ionospheric Disturbances: Longitudinal Comparison of Their Seasonal and Local Time Variations
DOI: https://doi.org/10.1029/2024sw004254

続きを表示（残り 90 件）

[2025] Asymmetric Ionospheric Disturbances Observed by GNSS During the 2017 Typhoon Talim and Doksuri: Origin and Characteristics
DOI: https://doi.org/10.1029/2025ja033854
[2025] A Case of Acquired Hemophilia A in an Elderly Patient Diagnosed After Sequestrectomy
DOI: https://doi.org/10.1016/j.ijom.2025.04.272
[2025] On the Extraordinary L‐Band Scintillation Event Observed in the American Sector During the 23–24 March 2023 Geomagnetic Storm
DOI: https://doi.org/10.1029/2024sw004213
[2025] A Bootstrapping Convolutional Neural Network Technique for Optimizing Automated Detection of Equatorial Plasma Bubbles by Optical All‐Sky Imagers
DOI: https://doi.org/10.1029/2024ea004117
[2025] Insights into Conjugate Hemispheric Ionospheric Disturbances Associated with the Beirut Port Explosion on 4 August 2020 Using Multi Low-Earth-Orbit Satellites
DOI: https://doi.org/10.3390/rs17111908
[2025] 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
DOI: https://doi.org/10.1029/2025gl114919
[2025] High‐Resolution GNSS Tomography of Storm‐Enhanced Density and Embedded Depletions Over Japan During the May 2024 Super Geomagnetic Storm
DOI: https://doi.org/10.1029/2025gl116567
[2025] Advanced detection methods and machine learning analysis of temporal and spatial patterns of equatorial plasma bubble depth
DOI: https://doi.org/10.1016/j.jastp.2025.106495
[2025] Responses of the Daytime Low and Equatorial Ionosphere and Thermosphere Over the Indian Region During the Geomagnetic Storm of April 2023
DOI: https://doi.org/10.1029/2024ja033141
[2025] Was the Unseasonal Development of Post‐Sunset Equatorial Plasma Bubbles in Southeast Asia Driven by Quasi‐2‐Day Planetary Waves?
DOI: https://doi.org/10.1029/2024ja033280
[2025] Coincident/Simultaneous Observations of Stratospheric Concentric Gravity Waves and Concentric Traveling Ionospheric Disturbances Over the Continental U.S. in 2022
DOI: https://doi.org/10.1029/2024ja033429
[2025] Thank You to Our 2024 Reviewers
DOI: https://doi.org/10.1029/2025gl115360
[2025] Multi‐Event Analysis of STEVE, SAR Arc, and Red/Green Arc at Subauroral Latitudes Using Data From Ground Optical and Radio Instruments and the Arase and Van Allen Probes Satellites
DOI: https://doi.org/10.1029/2024ja032793
[2025] Intelligent Detection and Propagation Parameter Calculation of Medium-Scale Traveling Ionospheric Disturbances Based on YOLO and Feature Matching
DOI: https://doi.org/10.1109/tgrs.2025.3613933
[2024] Monitoring of Ionospheric Variability Using the Low lAtitude Long Range Ionospheric raDar (LARID): Capabilities, Advantages and Limitations
DOI: https://doi.org/10.1029/2024sw004134
[2024] Midlatitude Plasma Blob‐like Structures Along With Super Equatorial Plasma Bubbles During the May 2024 Great Geomagnetic Storm
DOI: https://doi.org/10.1029/2024gl111638
[2024] X‐Raying Neutral Density Disturbances in the Mesosphere and Lower Thermosphere Induced by the 2022 Hunga‐Tonga Volcano Eruption‐Explosion
DOI: https://doi.org/10.1029/2024gl112025
[2024] Longitudinal Range of the Eastward‐Traveling Equatorial Plasma Bubble Inducing Ionospheric Scintillation
DOI: https://doi.org/10.1029/2024sw003908
[2024] 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
DOI: https://doi.org/10.1186/s40623-024-02051-2
[2024] Solar activity dependence for the relationship between nighttime medium-scale traveling ionospheric disturbance and sporadic E (Es) layer activities in summer during 1998–2019 over Japan
DOI: https://doi.org/10.1186/s40623-024-02023-6
[2024] Regional Ionospheric Super Bubble Induced by Significant Upward Plasma Drift During the 1 December 2023 Geomagnetic Storm
DOI: https://doi.org/10.1029/2024ja032430
[2024] Equatorial Plasma Bubble Onset During Strong and Weak Neutral Winds Over Southeast Asia
DOI: https://doi.org/10.17576/jkukm-2024-36(3)-36
[2024] Thank You to Our 2023 Peer Reviewers
DOI: https://doi.org/10.1029/2024gl109626
[2024] Leveraging machine learning techniques and GPS measurements for precise TEC rate predictions
DOI: https://doi.org/10.1007/s10291-024-01652-4
[2024] Statistical Analysis of Low‐Latitude Boundary of Polar‐Type Medium‐Scale Traveling Ionospheric Disturbances Observed by a 630‐nm Airglow Imager at Nyrölä, Finland
DOI: https://doi.org/10.1029/2023ja032077
[2024] Performance of the double-thin-shell approach for studying nighttime medium-scale traveling ionospheric disturbances using two dense GNSS observation networks in Japan
DOI: https://doi.org/10.1186/s40623-023-01956-8
[2024] Climatology of the Traveling Ionospheric Disturbances over Europe
DOI: https://doi.org/10.46620/ursiatrasc24/uxzi6366
[2023] Recent advances in L-band SAR observation of ionospheric irregularities from low to high latitudes
DOI: https://doi.org/10.46620/ursigass.2023.1805.jpnh5404
[2023] Machine learning approach for ionospheric scintillation prediction on ROTI parameter over the African region during solar cycle 24
DOI: https://doi.org/10.1016/j.asr.2023.12.026
[2023] Assessing the potential of ionosonde for forecasting post-sunset equatorial spread F: an observational experiment in Southeast Asia
DOI: https://doi.org/10.1186/s40623-023-01941-1
[2023] Statistical Analysis of the Horizontal Phase Velocity Distribution of Atmospheric Gravity Waves and Medium‐Scale Traveling Ionospheric Disturbances in Airglow Images Over Sata (31.0°N, 130.7°E), Japan
DOI: https://doi.org/10.1029/2023ja031600
[2023] Statistical Analysis of Global and Regional Ionospheric Total Electron Content (TEC) Using Extreme Value Distributions
DOI: https://doi.org/10.1109/tgrs.2023.3338513
[2023] New aspects of the upper atmospheric disturbances caused by the explosive eruption of the 2022 Hunga Tonga–Hunga Ha’apai volcano
DOI: https://doi.org/10.1186/s40623-023-01930-4
[2023] Ionospheric disturbances over South America related to Tonga volcanic eruption
DOI: https://doi.org/10.1186/s40623-023-01844-1
[2023] Periodic oscillations of Doppler frequency excited by the traveling ionospheric disturbances associated with the Tonga eruption in 2022
DOI: https://doi.org/10.1186/s40623-023-01914-4
[2023] Daytime Medium Scale Traveling Ionospheric Disturbances (MSTIDS) Over the Andes Mountains at Equatorial and Low Magnetic Latitudes
DOI: https://doi.org/10.1029/2023ja031477
[2023] Equinoctial asymmetry of plasma bubble occurrence and electric field at evening: GPS and ionosonde measurements in Southeast Asia
DOI: https://doi.org/10.1016/j.jastp.2023.106136
[2023] Spatio‐Temporal Characteristics of IPDP‐Type EMIC Waves on April 19, 2017: Implications for Loss of Relativistic Electrons in the Outer Belt
DOI: https://doi.org/10.1029/2023ja031479
[2023] Statistical Analysis of the Horizontal Phase Velocity Distribution of Atmospheric Gravity Waves and Medium‐Scale Traveling Ionospheric Disturbances in Airglow Images Over Darwin (12.4°S, 131.0°E)
DOI: https://doi.org/10.1029/2022ja030769
[2023] Equatorial plasma bubble intensities across longitudinal sectors of the globe using GNSS observations
DOI: https://doi.org/10.1016/j.jastp.2023.106097
[2023] Generation of equatorial plasma bubble after the 2022 Tonga volcanic eruption
DOI: https://doi.org/10.1038/s41598-023-33603-3
[2023] Day-to-day variability of the equatorial ionosphere in Asian sector during August–October 2019
DOI: https://doi.org/10.3389/fspas.2023.1198739
[2023] Multi‐Event Conjugate Measurements of the SAR Arc Detachment From the Auroral Oval Using DMSP Satellites and an All‐Sky Camera at Athabasca, Canada
DOI: https://doi.org/10.1029/2022ja030544
[2023] First Detection of Midlatitude Plasma Bubble by SuperDARN During a Geomagnetic Storm on May 27 and 28, 2017
DOI: https://doi.org/10.1029/2022ja031157
[2023] Statistical analysis for EUV dynamic spectra and their impact on the ionosphere during solar flares
DOI: https://doi.org/10.1186/s40623-023-01788-6
[2023] Solved and unsolved riddles about low-latitude daytime valley region plasma waves and 150-km echoes
DOI: https://doi.org/10.3389/fspas.2023.1091319
[2023] Dependence of Ionospheric Responses on Solar Wind Dynamic Pressure During Geomagnetic Storms Using Global Long‐Term GNSS‐TEC Data
DOI: https://doi.org/10.1029/2022ja030913
[2023] Tandem Observations of Nighttime Mid‐Latitude Topside Ionospheric Perturbations
DOI: https://doi.org/10.1029/2022sw003312
[2023] Multi‐Event Analysis of Magnetosphere‐Ionosphere Coupling of Nighttime Medium‐Scale Traveling Ionospheric Disturbances From the Ground and the Arase Satellite
DOI: https://doi.org/10.1029/2022ja030542
[2023] Ionospheric Modulation by EMIC Wave‐Driven Proton Precipitation: Observations and Simulations
DOI: https://doi.org/10.1029/2022ja030983
[2023] A Statistical Study of Longitudinal Extent of Pc1 Pulsations Using Seven PWING Ground Stations at Subauroral Latitudes
DOI: https://doi.org/10.1029/2021ja029987
[2023] An Extreme Value Analysis of Long-Term GNSS Ionospheric Total Electron Content Data Observed at Japan Grid Point Location (34.95° N and 134.05° E)
DOI: https://doi.org/10.1109/lgrs.2023.3292593
[2023] Equatorial plasma bubble extending to mid-latitudes observed by SuperDARN and GNSS-TEC during a geomagnetic storm on May 27 and 28, 2017
DOI: https://doi.org/10.46620/ursigass.2023.1634.hcta2488
[2023] Ionospheric response to the 2022 Tonga volcanic eruption based on global navigation satellite system-total electron content data
DOI: https://doi.org/10.46620/ursigass.2023.2810.oivq2557
[2023] Plasmaspheric Total Electron Content Variations obtained from GPS Total Electron Content Data
DOI: https://doi.org/10.46620/ursigass.2023.1065.vfla8348
[2023] Radio and optical investigation of role of E-F region coupling on the generation of nighttime MSTIDs
DOI: https://doi.org/10.46620/ursigass.2023.1190.arpk2417
[2023] Localized mesospheric ozone destruction induced by magnetospheric EMIC waves
DOI: https://doi.org/10.46620/ursigass.2023.0648.jaqu9828
[2023] Incoherent Scatter Observations by the MU Radar over Japan: Potential Contribution to the IRI Model
DOI: https://doi.org/10.46620/ursigass.2023.1460.spol5590
[2023] Equinoctial asymmetry of GPS scintillation occurrence and drift velocities at post-sunset in Southeast Asia
DOI: https://doi.org/10.46620/ursigass.2023.0146.pwhy9861
[2022] Relationship between geomagnetic storms and occurrence of ionospheric irregularities in the west sector of Africa during the peak of the 24th solar cycle
DOI: https://doi.org/10.3389/fspas.2022.969235
[2022] 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
DOI: https://doi.org/10.1016/j.asr.2022.10.029
[2022] Localized mesospheric ozone destruction corresponding to isolated proton aurora coming from Earth’s radiation belt
DOI: https://doi.org/10.1038/s41598-022-20548-2
[2022] Three‐Dimensional Fourier Analysis of Atmospheric Gravity Waves and Medium‐Scale Traveling Ionospheric Disturbances Observed in Airglow Images in Hawaii Over Three Years
DOI: https://doi.org/10.1029/2022ja030346
[2022] Statistical Study of Subauroral Arc Detachment at Athabasca, Canada: New Insights on STEVE
DOI: https://doi.org/10.1029/2021ja029856
[2022] Electromagnetic conjugacy of ionospheric disturbances after the 2022 Hunga Tonga-Hunga Ha’apai volcanic eruption as seen in GNSS-TEC and SuperDARN Hokkaido pair of radars observations
DOI: https://doi.org/10.1186/s40623-022-01665-8
[2022] The data for "Chain effects from EMIC waves, proton precipitation, and down to ionospheric responses"
DOI: https://doi.org/10.5281/zenodo.6800894
[2022] Geomagnetic conjugacy of plasma bubbles extending to mid-latitudes during a geomagnetic storm on March 1, 2013
DOI: https://doi.org/10.1186/s40623-022-01682-7
[2022] The data for "Ionospheric modulation by EMIC wave driven proton precipitation: observations and simulations"
DOI: https://doi.org/10.5281/zenodo.7330793
[2022] A confirmation of vertical acoustic resonance and field-aligned current generation just after the 2022 Hunga Tonga Hunga Ha’apai volcanic eruption
DOI: https://doi.org/10.1186/s40623-022-01653-y
[2022] Generation Mechanisms of Plasma Density Irregularity in the Equatorial Ionosphere During a Geomagnetic Storm on 21–22 December 2014
DOI: https://doi.org/10.1029/2021ja030240
[2022] On the Role of E‐F Region Coupling in the Generation of Nighttime MSTIDs During Summer and Equinox: Case Studies Over Northern Germany
DOI: https://doi.org/10.1029/2021ja030159
[2022] Propagation characteristics of sporadic E and medium-scale traveling ionospheric disturbances (MSTIDs): statistics using HF Doppler and GPS-TEC data in Japan
DOI: https://doi.org/10.1186/s40623-022-01616-3
[2022] ROLES OF EVENING EASTWARD NEUTRAL WIND AND EQUATORIAL ELECTROJET ON PRE-REVERSAL ENHANCEMENT INFERRED FROM GOCE SATELLITE AND GROUND-BASED OBSERVATIONS
DOI: https://doi.org/10.1142/9789811260100_0074
[2022] Modeling Post-Sunset Equatorial Spread-F Occurrence as a Function of Evening Upward Plasma Drift Using Logistic Regression, Deduced from Ionosondes in Southeast Asia
DOI: https://doi.org/10.3390/rs14081896
[2022] Statistical Behavior of Large‐Scale Ionospheric Disturbances From High Latitudes to Mid‐Latitudes During Geomagnetic Storms Using 20‐yr GNSS‐TEC Data: Dependence on Season and Storm Intensity
DOI: https://doi.org/10.1029/2021ja029687
[2022] Propagation Direction Analyses of Medium‐Scale Traveling Ionospheric Disturbances Observed Over North America With GPS‐TEC Perturbation Maps by Three‐Dimensional Spectral Analysis Method
DOI: https://doi.org/10.1029/2020ja028791
[2021] Relationship Between the Locations of the Midlatitude Trough and Plasmapause Using GNSS‐TEC and Arase Satellite Observation Data
DOI: https://doi.org/10.1029/2020ja028943
[2021] Propagation Mechanism of Medium Wave Broadcasting Waves Observed by the Arase Satellite: Hectometric Line Spectra
DOI: https://doi.org/10.1029/2021ja029813
[2021] Isolated Proton Aurora Driven by EMIC Pc1 Wave: PWING, Swarm, and NOAA POES Multi‐Instrument Observations
DOI: https://doi.org/10.1029/2021gl095090
[2021] L‐Band Synthetic Aperture Radar Observation of Ionospheric Density Irregularities at Equatorial Plasma Depletion Region
DOI: https://doi.org/10.1029/2021gl093541
[2021] Coupled investigations of ionosphere variations over European and Japanese regions: observations, comparative analysis, and validation of models and facilities
DOI: https://doi.org/10.1186/s40645-021-00441-8
[2021] PSTEP: project for solar–terrestrial environment prediction
DOI: https://doi.org/10.1186/s40623-021-01486-1
[2021] First Simultaneous Observation of a Night Time Medium‐Scale Traveling Ionospheric Disturbance From the Ground and a Magnetospheric Satellite
DOI: https://doi.org/10.1029/2020ja029086
[2021] Statistical study of medium-scale traveling ionospheric disturbances in low-latitude ionosphere using an automatic algorithm
DOI: https://doi.org/10.1186/s40623-021-01432-1
[2021] An experimental investigation into the possible connections between the zonal neutral wind speeds and equatorial plasma bubble drift velocities over the African equatorial region
DOI: https://doi.org/10.1016/j.jastp.2021.105663
[2021] The Occurrence Feature of Plasma Bubbles in the Equatorial to Midlatitude Ionosphere During Geomagnetic Storms Using Long‐Term GNSS‐TEC Data
DOI: https://doi.org/10.1029/2020ja029010
[2021] Influence of Zonal Wind Velocity Variation on Equatorial Plasma Bubble Occurrences Over Southeast Asia
DOI: https://doi.org/10.1029/2020ja028994
[2021] Simultaneous Observation of Two Isolated Proton Auroras at Subauroral Latitudes by a Highly Sensitive All‐Sky Camera and Van Allen Probes
DOI: https://doi.org/10.1029/2020ja029078
[2021] Model-based reproduction and validation of the total spectra of a solar flare and their impact on the global environment at the X9.3 event of September 6, 2017
DOI: https://doi.org/10.1186/s40623-021-01376-6
[2021] Multi‐Event Analysis of Plasma and Field Variations in Source of Stable Auroral Red (SAR) Arcs in Inner Magnetosphere During Non‐Storm‐Time Substorms
DOI: https://doi.org/10.1029/2020ja029081

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AI 要約（直近 5 年の研究成果）

外部リンク

関連研究室(8 件)

研究成果（100 件）

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所属学会・役職（0 件）