Basic Information

Affiliated programs (koza)

• Graduate School of Informatics, 通信情報システム 地球電波工学, 准教授

Concurrent Affiliation

• 宇宙総合学研究ユニット
• 宇宙総合学研究ユニット

Professional Memberships

• American Geophysical Union
• JAPAN GEOSCIENCE UNION
• SOCIETY OF GEOMAGNETISM AND EARTH, PLANETARY AND SPACE SCIENCES

Academic Degree

• Master of Informatics(Kyoto University)
• Doctor of Informatics(Kyoto University)

Academic Resume (Graduate Schools)

• Kyoto University, Graduate School of Informatics, 修了
• Kyoto University, Graduate School of Informatics, 修了

Academic Resume (Undergraduate School/Majors)

• Kyoto University, Faculty of Engineering, 卒業

High School

• High School

  Nara High School

Research History

• From Nov. 2018, To Present

  Kyoto University, Research Institute for Sustainable Humanosphere, Associate Professor
• From Apr. 2016, To Nov. 2018

  National Institute of Information and Communications Technology, Space Environment Laboratory, Senior Researcher
• From Apr. 2014, To Mar. 2016

  National Institute of Information and Communications Technology, Space Environment Laboratory, Senior Researcher
• From Apr. 2013, To Mar. 2014

  National Institute of Information and Communications Technology, Space Environment Laboratory, Researcher
• From Nov. 2011, To Mar. 2013

  Kyoto University, Research Institute for Sustainable Humanosphere, Researcher
• From Apr. 2010, To Oct. 2011

  NASA Goddard Space Flight Center, Space Weather Laboratory, Visiting Assistant Research Scientist
• From Apr. 2008, To Mar. 2010

  Cornell University, Earth and Atmospheric Sciences, JSPS Research Fellow for Research Abroad
• From Nov. 2006, To Mar. 2010

  Cornell University, Earth and Atmospheric Sciences, Postdoctoral Fellow
• From Apr. 2005, To Mar. 2008

  Nagoya University, Solar-Terrestrial Environment Laboratory, JSPS Research Fellow (PD)
• From Apr. 2004, To Mar. 2005

  Kyoto University, Research Institute for Sustainable Humanosphere, Researcher
• From Apr. 2002, To Mar. 2004

  Kyoto University, Radio Science Center for Space and Atmosphere, JSPS Research Fellow (DC2)

Profile

• Profile

  Studying ionosphere with observations and simulations belonging to four domains (ac.jp, go.jp, edu, gov). Research targets are the basic ionospheric physics and application to radio propagation based on observations with radars, satellites, and sounding rockets, and original numerical simulation models.

Language of Instruction

• English
• Japanese

ID,URL

• J-Global ID

  201801016674179156

• External link

  http://www.rish.kyoto-u.ac.jp/~yokoyama/

Website(s) (URL(s))

• http://www.rish.kyoto-u.ac.jp/~yokoyama/

researchmap URL

• https://researchmap.jp/tatsuhiro_yokoyama

Research

Research Topics, Overview of the research

• Research Topics

  Observation ans simulation of ionospheric irregularities

• Overview of the research

  Earth's ionosphere consists of neutral atmosphere and ionized plasma particles which can be regarded as a transition region from Earth to space. Plasma instabilities in the ionosphere genereate various irregular plasma density structures and cause severe satellite communication and navigation outage. My research aims at understanding the plasma dynamics in the ionosphere and forecasting the occurrence of irregularities by observations and simulations.

Research Interests

• simulation
• radar
• sporadic-E layer
• MSTID
• plasma bubble
• ionosphere

Research Areas

• Natural sciences, Space and planetary science, Ionosphere

Papers

• Satellite Traces: Ionogram Signatures of Bottom‐Side Upwelling Structures ‐ A Simulation Study

  M. Ankita; S. Tulasi Ram; T. Yokoyama; R. T. Tsunoda; A. P. Dimri; S. Mondal; Chinmaya Nayak

  Geophysical Research Letters, 16 Apr. 2025

  
• Spread F occurrence features at different longitudinal regions during low and moderate solar activity

  Abimbola O. Afolayan; Singh J. Mandeep; Mardina Abdullah; Suhaila M. Buhari; Tatsuhiro Yokoyama; Pornchai Supnithi

  27 Feb. 2019

  
• Observations of daytime topside ionospheric irregularities in the afternoon equatorial ionosphere

  Chunhua Jiang; Lehui Wei; Tatsuhiro Yokoyama; Rong Tian; Tongxin Liu; Guobin Yang

  Advances in Space Research, 01 Jan. 2025

  
• Simulation study of the impacts of E-region density on the growth of equatorial plasma bubbles

  Tatsuhiro Yokoyama

  Frontiers in Astronomy and Space Sciences, 2024

  
• Channel Mixer Layer: Multimodal Fusion Toward Machine Reasoning for Spatiotemporal Predictive Learning of Ionospheric Total Electron Content

  Peng Liu; Tatsuhiro Yokoyama; Takuya Sori; Mamoru Yamamoto

  Space Weather, Dec. 2024

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• Special issue “16th International Symposium on Equatorial Aeronomy (ISEA-16), 2022”

  Tatsuhiro Yokoyama; Jeffrey Klenzing; Marco A. Milla; Claudia Stolle; Duggirala Pallamraju

  Earth, Planets and Space, Sep. 2024, Invited

  
• Solar and geomagnetic activity dependence of 150-km echoes observed by the Equatorial Atmosphere Radar in Indonesia

  Tatsuhiro Yokoyama; Rieko Takagi; Mamoru Yamamoto

  Earth, Planets and Space, Dec. 2022, Peer-reviewed

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• Physics-Based Modeling Activity from the Solar Surface to the Earth's Atmosphere Including Magnetosphere and Ionosphere at NICT

  Mamoru Ishii; Mitsue Den; Hidekatsu Jin; Yuki Kubo; Yasubumi Kubota; Aoi Nakamizo; Hiroyuki Shinagawa; Daikou Shiota; Takashi Tanaka; Chihiro Tao; Shinichi Watari; Tatsuhiro Yokoyama

  Proceedings of the International Astronomical Union, 2017

  
• Investigation of the Occurrence Characteristics and Possible Origins of Daytime Spread F Irregularities in Low Latitude Region

  Lehui Wei; Chunhua Jiang; Tatsuhiro Yokoyama; Jing Liu; Guobin Yang; Yaogai Hu

  Journal of Geophysical Research: Space Physics, Jan. 2024, Peer-reviewed

  
• Calibrating estimates of ionospheric long-term change

  Christopher John Scott; Matthew N. Wild; Luke Anthony Barnard; Bingkun Yu; Tatsuhiro Yokoyama; Michael Lockwood; Cathryn Mitchel; John Coxon; Andrew Kavanagh

  Annales Geophysicae, 24 Sep. 2024, Peer-reviewed

  
• Statistical Analysis of Medium‐Scale Traveling Ionospheric Disturbances Over Japan Based on Deep Learning Instance Segmentation

  Peng Liu; Tatsuhiro Yokoyama; Weizheng Fu; Mamoru Yamamoto

  Space Weather, Jul. 2022, Peer-reviewed

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• Modeling of Multi-Ion Plasma Bubbles in the Equatorial Ionosphere

  Chunhua Jiang; Lehui Wei; Tatsuhiro Yokoyama; Rong Tian; Tongxin Liu; Guobin Yang

  Journal of Geophysical Research: Space Physics, Oct. 2023, Peer-reviewed

  
• A three-dimensional stochastic structure model derived from high-resolution isolated equatorial plasma bubble simulations

  Charles Rino; Tatsuhiro Yokoyama; Charles Carrano

  Earth, Planets and Space, Apr. 2023, Peer-reviewed

  
• Nighttime Midlatitude E-F Coupling in Geomagnetic Conjugate Ionospheres: A Double Thin Shell Model and a Multi-Source Data Investigation

  Weizheng Fu; Tatsuhiro Yokoyama; Nicholas Ssessanga; Guanyi Ma; Mamoru Yamamoto

  Journal of Geophysical Research: Space Physics, Mar. 2023, Peer-reviewed

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• Fast Ionogram Observations of Ascending Thin Layers Locally Transported from the E to F Region at Equatorial and Low Latitudes

  Lianhuan Hu; Guozhu Li; Zonghua Ding; Wenjie Sun; Xiukuan Zhao; Haiyong Xie; Zhengping Zhu; Tatsuhiro Yokoyama; Jiaping Lan; Zhaoguo Huang; Baiqi Ning

  Remote Sensing, Nov. 2022, Peer-reviewed

  
• Effect of the seed perturbation amplitude on the equatorial spread F initiation during solar minimum

  A. O. Afolayan; J. S. Mandeep; M. Abdullah; N. S A Hamid; T. Yokoyama

  Advances in Space Research, 01 Jan. 2023, Peer-reviewed

  
• On using a double-thin-shell approach and TEC perturbation component to sound night-time mid-latitude E–F coupling

  Weizheng Fu; Tatsuhiro Yokoyama; Nicholas Ssessanga; Mamoru Yamamoto; Peng Liu

  Earth, Planets and Space, Dec. 2022, Peer-reviewed

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• Upwelling coherent backscatter plumes observed with ionosondes in low-latitude region

  Chunhua Jiang; Lehui Wei; Tatsuhiro Yokoyama; Jiyao Xu; Kun Wu; Wei Yuan; Jing Liu; Tongxin Liu; Guobin Yang; Zhengyu Zhao

  Journal of Space Weather and Space Climate, 2022, Peer-reviewed

  
• Ionospheric High-resolution Simulation

  横山竜宏

  情報通信研究機構研究報告, 2021

  
• High-Resolution 3-D Imaging of Daytime Sporadic-E Over Japan by Using GNSS TEC and Ionosondes

  Weizheng Fu; Nicholas Ssessanga; Tatsuhiro Yokoyama; Mamoru Yamamoto

  Space Weather, Dec. 2021, Peer-reviewed

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• Propagation Mechanism of Medium Wave Broadcasting Waves Observed by the Arase Satellite: Hectometric Line Spectra

  Kozo Hashimoto; Atsuki Shinbori; Yuichi Otsuka; Fuminori Tsuchiya; Atsushi Kumamoto; Yoshiya Kasahara; Ayako Matsuoka; Isamu Nagano; Yoshizumi Miyoshi; Tatsuhiro Yokoyama

  Journal of Geophysical Research: Space Physics, Nov. 2021, Peer-reviewed

  
• Anomalous Increase in the Occurrence of Post-Midnight FAI Radar Echoes in September 2019 and Its Relation With the Austral Sudden Stratospheric Warming

  S. Meenakshi; S. Sridharan; J. Solomon Ivan; K. Hozumi; C. Y. Yatini; T. Yokoyama; H. Hashiguchi

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Jun. 2021, Peer-reviewed

  
• Nonlinear Simulation of Ionospheric Irregularities at Mars

  Chunhua Jiang; Tatsuhiro Yokoyama; Lehui Wei; Guobin Yang; Zhengyu Zhao

  ASTROPHYSICAL JOURNAL, Mar. 2021, Peer-reviewed

  
• On the Generation of an Unseasonal EPB Over South East Asia

  J. L. Currie; B. A. Carter; J. Retterer; T. Dao; R. Pradipta; R. Caton; K. Groves; Y. Otsuka; T. Yokoyama; K. Hozumi; T. Le Truong; M. Terkildsen

  Journal of Geophysical Research: Space Physics, Feb. 2021, Peer-reviewed

  
• Daytime Dynamo Electrodynamics With Spiral Currents Driven by Strong Winds Revealed by Vapor Trails and Sounding Rocket Probes

  R. Pfaff; M. Larsen; T. Abe; H. Habu; J. Clemmons; H. Freudenreich; D. Rowland; T. Bullett; M.‐Y. Yamamoto; S. Watanabe; Y. Kakinami; T. Yokoyama; J. Mabie; J. Klenzing; R. Bishop; R. Walterscheid; M. Yamamoto; Y. Yamazaki; N. Murphy; V. Angelopoulos

  Geophysical Research Letters, 16 Aug. 2020, Peer-reviewed

  
• Dilatory and Downward Development of 3‐m Scale Irregularities in the Funnel‐Like Region of a Rapidly Rising Equatorial Plasma Bubble

  S. Tulasi Ram; K. K. Ajith; T. Yokoyama; M. Yamamoto; K. Hozumi; K. Shiokawa; Y. Otsuka; G. Li

  Geophysical Research Letters, 16 Jul. 2020, Peer-reviewed

  
• Investigation of Spatiotemporal Morphology of Plasma Bubbles Based on EAR Observations

  L.M. Joshi; L.‐C. Tsai; S.‐Y. Su; Y. Otsuka; T. Yokoyama; M. Yamamoto; S. Sarkhel; K. Hozumi; C.‐H. Lu

  Journal of Geophysical Research: Space Physics, 12 Dec. 2019, Peer-reviewed

  
• All‐Sky Imaging Observations and Modeling of Bright 630‐nm Airglow Structures Associated With MSTIDs

  C. Martinis; T. Yokoyama; M. Nishioka

  Journal of Geophysical Research: Space Physics, 26 Aug. 2019, Peer-reviewed

  
• Observation of seasonal asymmetry in the range spread F occurrence at different longitudes during low and moderate solar activity

  Abimbola O. Afolayan; Mandeep Jit Singh; Mardina Abdullah; Suhaila M. Buhari; Tatsuhiro Yokoyama; Pornchai Supnithi

  Annales Geophysicae, 21 Aug. 2019, Peer-reviewed

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• Seeding of Equatorial Plasma Bubbles by Vertical Neutral Wind

  Tatsuhiro Yokoyama; Hidekatsu Jin; Hiroyuki Shinagawa; Huixin Liu

  GEOPHYSICAL RESEARCH LETTERS, Jul. 2019, Peer-reviewed

  
• SEAIONO: A Windows software tool to extract ionogram dataset from South East Asia Low-Latitude Ionospheric Observation Network

  S. A. Bello; M. Abdullah; N. S.A. Hamid; T. Yokoyama

  Journal of Physics: Conference Series, 04 Mar. 2019

  
• Development of HF modelling in Peninsular Malaysia during the rise of solar cycle 24

  Rafidah Abd Malik; Mardina Abdullah; Sabirin Abdullah; Yokoyama Tatsuhiro; Clara Y. Yatini

  Defence S and T Technical Bulletin, 2019

  
• A Configuration Space Model for Intermediate-Scale Ionospheric Structure

  Charles Rino; Charles Carrano; Keith Groves; Tatsuhiro Yokoyama

  Radio Science, 04 Dec. 2018, Peer-reviewed

  
• Dynamic spectral characteristics of high-resolution simulated equatorial plasma bubbles

  Rino, Charles; Yokoyama, Tatsuhiro; Carrano, Charles

  PROGRESS IN EARTH AND PLANETARY SCIENCE, Dec. 2018, Peer-reviewed

  
• Unseasonal development of post-sunset F-region irregularities over Southeast Asia on 28 July 2014: 1. Forcing from above?

  Carter, B.A.; Ram, S.T.; Yizengaw, E.; Pradipta, R.; Retterer, J.; Norman, R.; Currie, J.; Groves, K.; Caton, R.; Terkildsen, M.; Yokoyama, T.; Zhang, K.

  Progress in Earth and Planetary Science, 2018, Peer-reviewed

  
• Daily and seasonal variations in the linear growth rate of the Rayleigh-Taylor instability in the ionosphere obtained with GAIA

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

  Progress in Earth and Planetary Science, 2018, Peer-reviewed

  
• Low and Midlatitude Ionospheric Plasma Density Irregularities and Their Effects on Geomagnetic Field

  Tatsuhiro Yokoyama; Claudia Stolle

  SPACE SCIENCE REVIEWS, 2018, Peer-reviewed

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

  Pavan Chaitanya, P.; Patra, A.K.; Otsuka, Y.; Yokoyama, T.; Yamamoto, M.

  Journal of Geophysical Research: Space Physics, 2018, Peer-reviewed

  
• Spatial Features of L-Band Equinoctial Scintillations From Equator to Low Midlatitude at Around 95°E During 2015–2016

  Dutta, B.; Kalita, B.R.; Bhuyan, P.K.; Sarmah, S.; Tiwari, R.C.; Wang, K.; Hozumi, K.; Tsugawa, T.; Yokoyama, T.; Le Huy, M.; Pham, T.T.H.

  Journal of Geophysical Research: Space Physics, 2018, Peer-reviewed

  
• Unseasonal development of post-sunset F-region irregularities over Southeast Asia on 28 July 2014: 2. Forcing from below?

  Ajith, K.K.; Tulasi Ram, S.; Carter, B.A.; Sathish Kumar, S.; Yamamoto, M.; Yokoyama, T.; Gurubaran, S.; Sripathi, S.; Hozumi, K.; Groves, K.; Caton, R.G.

  Progress in Earth and Planetary Science, 2018, Peer-reviewed

  
• Geomagnetically conjugate observations of ionospheric and thermospheric variations accompanied by a midnight brightness wave at low latitudes

  D. Fukushima; K. Shiokawa; Y. Otsuka; M. Kubota; T. Yokoyama; M. Nishioka; S. Komonjinda; C. Y. Yatini

  EARTH PLANETS AND SPACE, Aug. 2017, Peer-reviewed

  
• A new expression for computing the bottomside thickness parameter and comparisons with the NeQuick and IRI-2012 models during declining phase of solar cycle 23 at equatorial latitude station, Chumphon, Thailand

  Punyawi Jamjareegulgarn; Pornchai Supnithi; Kornyanat Watthanasangmechai; Tatsuhiro Yokoyama; Takuya Tsugawa; Mamoru Ishii

  ADVANCES IN SPACE RESEARCH, Jul. 2017, Peer-reviewed

  
• Vertical rise velocity of equatorial plasma bubbles estimated from Equatorial Atmosphere Radar (EAR) observations and HIRB model simulations

  S. Tulasi Ram; K. K. Ajith; T. Yokoyama; M. Yamamoto; K. Niranjan

  Journal of Geophysical Research: Space Physics, 05 Jun. 2017, Peer-reviewed

  
• Detection of Plasma Bubble in Ionosphere using GPS Receivers in Southeast Asia

  Suhaila M. Buhari; Mardina Abdullah; Yuichi Otsuka; Tatsuhiro Yokoyama; Michi Nishioka; Alina Marie Hasbi; Takuya Tsugawa

  SAINS MALAYSIANA, Jun. 2017, Peer-reviewed

  
• Equatorial and low-latitude ionospheric response to the 17-18 March 2015 great storm over Southeast Asia longitude sector

  Chunhua Jiang; Guobin Yang; Jing Liu; Tatsuhiro Yokoyama; Tongxin Liu; Ting Lan; Chen Zhou; Yuannong Zhang; Zhengyu Zhao; Tharadol Komolmis; Pornchai Supnithi; Clara Y. Yatini

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, May 2017, Peer-reviewed

  
• Prediction and measurement of high frequency radio frequencies in Peninsular Malaysia and comparisons with the international reference ionosphere model

  R. A. Malik; M. Abdullah; S. Abdullah; M. J. Homam; T. Yokoyama; C. Y. Yatini

  Advanced Science Letters, 01 Feb. 2017, Peer-reviewed

  
• Low-latitude daytime F region irregularities observed in two geomagnetically quiet days by the Hainan coherent scatter phased array radar (HCOPAR)

  Gang Chen; Han Jin; Jingye Yan; Shaodong Zhang; Guozhu Li; Tatsuhiro Yokoyama; Guotao Yang; Chunxiao Yan; Chen Wu; Jin Wang; Dingkun Zhong; Yaxian Li; Zhihua Wang

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Feb. 2017, Peer-reviewed

  
• Climatology of successive equatorial plasma bubbles observed by GPS ROTI over Malaysia

  S. M. Buhari; M. Abdullah; T. Yokoyama; Y. Otsuka; M. Nishioka; A. M. Hasbi; S. A. Bahari; T. Tsugawa

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Feb. 2017, Peer-reviewed

  
• Daytime zonal drifts in the ionospheric 150 km and E regions estimated using EAR observations

  Pavan Chaitanya, P.; Patra, A.K.; Otsuka, Y.; Yokoyama, T.; Yamamoto, M.; Stoneback, R.A.; Heelis, R.A.

  Journal of Geophysical Research: Space Physics, 2017, Peer-reviewed

  
• The Solar Flux Dependence of Ionospheric 150 km Radar Echoes and Implications

  Patra, A.K.; Pavan Chaitanya, P.; St.-Maurice, J.-P.; Otsuka, Y.; Yokoyama, T.; Yamamoto, M.

  Geophysical Research Letters, 2017, Peer-reviewed

  
• A review on the numerical simulation of equatorial plasma bubbles toward scintillation evaluation and forecasting

  Yokoyama, T.

  Progress in Earth and Planetary Science, 2017, Peer-reviewed

  
• Ionosonde observations of daytime spread F at low latitudes

  Chunhua Jiang; Guobin Yang; Jing Liu; Tatsuhiro Yokoyama; Tharadol Komolmis; Huan Song; Ting Lan; Chen Zhou; Yuannong Zhang; Zhengyu Zhao

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Dec. 2016, Peer-reviewed

  
• Off-great-circle paths in transequatorial propagation: 2. Nonmagnetic-field-aligned reflections

  Roland T. Tsunoda; Takashi Maruyama; Takuya Tsugawa; Tatsuhiro Yokoyama; Mamoru Ishii; Trang T. Nguyen; Tadahiko Ogawa; Michi Nishioka

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Nov. 2016, Peer-reviewed

  
• Conjugate hemisphere ionospheric response to the St. Patrick's Day storms of 2013 and 2015 in the 100 degrees E longitude sector

  Bitap Raj Kalita; Rumajyoti Hazarika; Geetashree Kakoti; P. K. Bhuyan; D. Chakrabarty; G. K. Seemala; K. Wang; S. Sharma; T. Yokoyama; P. Supnithi; T. Komolmis; C. Y. Yatini; M. Le Huy; P. Roy

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Nov. 2016, Peer-reviewed

  
• Off-great-circle paths in transequatorial propagation: 1. Discrete and diffuse types

  Roland T. Tsunoda; Takashi Maruyama; Takuya Tsugawa; Tatsuhiro Yokoyama; Mamoru Ishii; Trang T. Nguyen; Tadahiko Ogawa; Michi Nishioka

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Nov. 2016, Peer-reviewed

  
• Predawn plasma bubble cluster observed in Southeast Asia

  Kornyanat Watthanasangmechai; Mamoru Yamamoto; Akinori Saito; Roland Tsunoda; Tatsuhiro Yokoyama; Pornchai Supnithi; Mamoru Ishii; Clara Yatini

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Jun. 2016, Peer-reviewed

  
• Reconstruction of the vertical electron density profile based on vertical TEC using the simulated annealing algorithm

  Chunhua Jiang; Guobin Yang; Peng Zhu; Michi Nishioka; Tatsuhiro Yokoyama; Chen Zhou; Huan Song; Ting Lan; Zhengyu Zhao; Yuannong Zhang

  ADVANCES IN SPACE RESEARCH, May 2016, Peer-reviewed

  
• Latitudinal variation of the specific local time of postmidnight enhancement peaks in F layer electron density at low latitudes: A case study

  Chunhua Jiang; Chi Deng; Guobin Yang; Jing Liu; Peng Zhu; Tatsuhiro Yokoyama; Huan Song; Ting Lan; Chen Zhou; Xiongbin Wu; Yuannong Zhang; Zhengyu Zhao; Tharadol Komolmis; Pornchai Supnithi; Clara Y. Yatini

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Apr. 2016, Peer-reviewed

  
• Duskside enhancement of equatorial zonal electric field response to convection electric fields during the St. Patrick's Day storm on 17 March 2015

  S. Tulasi Ram; T. Yokoyama; Y. Otsuka; K. Shiokawa; S. Sripathi; B. Veenadhari; R. Heelis; K. K. Ajith; V. S. Gowtam; S. Gurubaran; P. Supnithi; M. Le Huy

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Jan. 2016, Peer-reviewed

  
• Measurement of Ionosphere over the Western Pacific Ocean

  Mamoru Ishii; Hidekatsu Jin; Tatsuhiro Yokoyama; Takuya Tsugawa; Michi Nishioka; Takashi Maruyama

  2016 URSI ASIA-PACIFIC RADIO SCIENCE CONFERENCE (URSI AP-RASC), 2016, Peer-reviewed

  
• Variations of Ionospheric Slab Thickness over the Magnetic Equator of Southeast Asia

  P. Jamjareegulgarn; P. Supnithi; K. Watthanasangmechai; T. Yokoyama; T. Tsugawa; M. Ishii; Chinmaya Nayak

  2016 13TH INTERNATIONAL CONFERENCE ON ELECTRICAL ENGINEERING/ELECTRONICS, COMPUTER, TELECOMMUNICATIONS AND INFORMATION TECHNOLOGY (ECTI-CON), 2016, Peer-reviewed

  
• Estimation of the single GPS-receiver bias using the gradient descent algorithm

  Athiwat Chiablaem; Pornchai Supnithi; Somjai Klinngam; Prasert Kenpankho; Chaiwat Panachart; Kornyanat Watthanasangmechai; Tatsuhiro Yokoyama; Takuya Tsugawa; Mamoru Ishii; Apithep Saekow

  2016 13TH INTERNATIONAL CONFERENCE ON ELECTRICAL ENGINEERING/ELECTRONICS, COMPUTER, TELECOMMUNICATIONS AND INFORMATION TECHNOLOGY (ECTI-CON), 2016, Peer-reviewed

  
• Simultaneous observations of F-2 layer stratification and spread F at postmidnight over a northern equatorial anomaly region

  Chunhua Jiang; Guobin Yang; Chi Deng; Chen Zhou; Peng Zhu; Tatsuhiro Yokoyama; Huan Song; Ting Lan; Binbin Ni; Zhengyu Zhao; Yuannong Zhang

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Dec. 2015, Peer-reviewed

  
• West wall structuring of equatorial plasma bubbles simulated by three-dimensional HIRB model

  T. Yokoyama; H. Jin; H. Shinagawa

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Oct. 2015, Peer-reviewed

  
• Fresh and evolutionary-type field-aligned irregularities generated near sunrise terminator due to overshielding electric fields

  S. Tulasi Ram; K. K. Ajith; M. Yamamoto; Y. Otsuka; T. Yokoyama; K. Niranjan; S. Gurubaran

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Jul. 2015, Peer-reviewed

  
• Temporal change of EIA asymmetry revealed by a beacon receiver network in Southeast Asia

  Kornyanat Watthanasangmechai; Mamoru Yamamoto; Akinori Saito; Takashi Maruyama; Tatsuhiro Yokoyama; Michi Nishioka; Mamoru Ishii

  EARTH PLANETS AND SPACE, May 2015, Peer-reviewed

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• Explicit characteristics of evolutionary-type plasma bubbles observed from Equatorial Atmosphere Radar during the low to moderate solar activity years 2010-2012

  K. K. Ajith; S. Tulasi Ram; M. Yamamoto; T. Yokoyama; V. Sai Gowtam; Y. Otsuka; T. Tsugawa; K. Niranjan

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Feb. 2015, Peer-reviewed

  
• Climatology of Equatorial Plasma Bubble Observed by MyRTKnet over the Years 2008-2013

  S. M. Buhari; M. Abdullah; T. Yokoyama; A. M. Hasbi; Y. Otsuka; M. Nishioka; S. A. Bahari; T. Tsugawa

  2015 INTERNATIONAL CONFERENCE ON SPACE SCIENCE AND COMMUNICATION (ICONSPACE), 2015, Peer-reviewed

  
• Ionospheric Empirical Model: Initial Approach to MUF Modeling in the Malaysian Region

  R. A. Malik; M. Abdullah; S. Abdullah; M. J. Homam; T. Yokoyama; N. Michi

  2015 INTERNATIONAL CONFERENCE ON SPACE SCIENCE AND COMMUNICATION (ICONSPACE), 2015, Peer-reviewed

  
• Continuous generation and two-dimensional structure of equatorial plasma bubbles observed by high-density GPS receivers in Southeast Asia

  S. M. Buhari; M. Abdullah; A. M. Hasbi; Y. Otsuka; T. Yokoyama; M. Nishioka; T. Tsugawa

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Dec. 2014, Peer-reviewed

  
• Nonlinear growth, bifurcation, and pinching of equatorial plasma bubble simulated by three-dimensional high-resolution bubble model

  T. Yokoyama; H. Shinagawa; H. Jin

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Dec. 2014, Peer-reviewed

  
• Latitudinal GRBR-TEC estimation in Southeast Asia region based on the two-station method

  Kornyanat Watthanasangmechai; Mamoru Yamamoto; Akinori Saito; Takuya Tsugawa; Tatsuhiro Yokoyama; Pornchai Supnithi; Clara Yono Yatini

  RADIO SCIENCE, Oct. 2014, Peer-reviewed

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• Hemisphere-coupled modeling of nighttime medium-scale traveling ionospheric disturbances

  Tatsuhiro Yokoyama

  ADVANCES IN SPACE RESEARCH, Aug. 2014, Peer-reviewed

  
• Vertical ExB drifts from radar and C/NOFS observations in the Indian and Indonesian sectors: Consistency of observations and model

  A. K. Patra; P. Pavan Chaitanya; Y. Otsuka; T. Yokoyama; M. Yamamoto; R. A. Stoneback; R. A. Heelis

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, May 2014, Peer-reviewed

  
• Study of medium-scale traveling ionospheric disturbances (MSTID) with sounding rockets and ground observations

  Mamoru Yamamoto; Tomohiro Kato; Keigo Ishisaka; Tatsuhiro Yokoyama; Naomoto Iwagami; Takao Takahashi; Makoto Tanaka; Ken Endo; Atsushi Kumamoto; Shigeto Watanabe; Masa-yuki Yamamoto; Takumi Abe; Susumu Saito; Takuya Tsugawa; Michi Nishioka; Paul Bernhardt; Miguel Larsen

  2014 XXXITH URSI GENERAL ASSEMBLY AND SCIENTIFIC SYMPOSIUM (URSI GASS), 2014

  
• Longitudinal characteristics of spread F backscatter plumes observed with the EAR and Sanya VHF radar in Southeast Asia

  Guozhu Li; Baiqi Ning; M. A. Abdu; Yuchi Otsuka; T. Yokoyama; M. Yamamoto; Libo Liu

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Oct. 2013, Peer-reviewed

  
• Scale dependence and frontal formation of nighttime medium-scale traveling ionospheric disturbances

  Tatsuhiro Yokoyama

  GEOPHYSICAL RESEARCH LETTERS, Sep. 2013, Peer-reviewed

  
• Drift velocities of 150-km field-aligned irregularities observed by the equatorial atmosphere radar

  Otsuka, Y.; Mizutani, N.; Shiokawa, K.; Patra, A.; Yokoyama, T.; Yamamoto, M.

  Antarctic Record, 2013, Peer-reviewed

  
• Detection of ionospheric Alfven resonator signatures in the equatorial ionosphere

  Fernando Simoes; Jeffrey Klenzing; Stoyan Ivanov; Robert Pfaff; Henry Freudenreich; Dieter Bilitza; Douglas Rowland; Kenneth Bromund; Maria Carmen Liebrecht; Steven Martin; Peter Schuck; Paulo Uribe; Tatsuhiro Yokoyama

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Nov. 2012, Peer-reviewed

  
• A comparative study of equatorial daytime vertical E x B drift in the Indian and Indonesian sectors based on 150 km echoes

  A. K. Patra; P. Pavan Chaitanya; N. Mizutani; Y. Otsuka; T. Yokoyama; M. Yamamoto

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Nov. 2012, Peer-reviewed

  
• On postmidnight low-latitude ionospheric irregularities during solar minimum: 2. C/NOFS observations and comparisons with the Equatorial Atmosphere Radar

  T. Yokoyama; R. F. Pfaff; P. A. Roddy; M. Yamamoto; Y. Otsuka

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Nov. 2011, Peer-reviewed

  
• On postmidnight low-latitude ionospheric irregularities during solar minimum: 1. Equatorial Atmosphere Radar and GPS-TEC observations in Indonesia

  T. Yokoyama; M. Yamamoto; Y. Otsuka; M. Nishioka; T. Tsugawa; S. Watanabe; R. F. Pfaff

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Nov. 2011, Peer-reviewed

  
• Multi-instrumental observation of weak magnetic storms occurred during the period, 18-21 March 2002

  K. Unnikrishnan; S. Kawamura; A. Saito; T. Yokoyama; S. Fukao

  JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, Aug. 2011, Peer-reviewed

  
• A new midlatitude ionosphere electrodynamics coupling model (MIECO): Latitudinal dependence and propagation of medium-scale traveling ionospheric disturbances

  Tatsuhiro Yokoyama; David L. Hysell

  GEOPHYSICAL RESEARCH LETTERS, Apr. 2010, Peer-reviewed

  
• Density enhancements associated with equatorial spread F

  J. Krall; J. D. Huba; G. Joyce; T. Yokoyama

  ANNALES GEOPHYSICAE, 2010, Peer-reviewed

  
• Spatial relationship of nighttime medium-scale traveling ionospheric disturbances and F region field-aligned irregularities observed with two spaced all-sky airglow imagers and the middle and upper atmosphere radar

  Y. Otsuka; K. Shiokawa; T. Ogawa; T. Yokoyama; M. Yamamoto

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, May 2009, Peer-reviewed

  
• Three-dimensional simulation of the coupled Perkins and E-s-layer instabilities in the nighttime midlatitude ionosphere

  Tatsuhiro Yokoyama; David L. Hysell; Yuichi Otsuka; Mamoru Yamamoto

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Mar. 2009, Peer-reviewed

  
• Zonal asymmetry of daytime 150-km echoes observed by Equatorial Atmosphere Radar in Indonesia

  T. Yokoyama; D. L. Hysell; A. K. Patra; Y. Otsuka; M. Yamamoto

  ANNALES GEOPHYSICAE, 2009, Peer-reviewed

  
• Daytime 150-km echoes observed with the Equatorial Atmosphere Radar in Indonesia: First results

  A. K. Patra; T. Yokoyama; Y. Otsuka; M. Yamamoto

  GEOPHYSICAL RESEARCH LETTERS, Mar. 2008, Peer-reviewed

  
• First three-dimensional simulation of the Perkins instability in the nighttime midlatitude ionosphere

  Tatsuhiro Yokoyama; Yuichi Otsuka; Tadahiko Ogawa; Mamoru Yamamoto; David L. Hysell

  GEOPHYSICAL RESEARCH LETTERS, Feb. 2008, Peer-reviewed

  
• Energetics and structure of the lower E region associated with sporadic E layer

  K. -I. Oyama; K. Hibino; T. Abe; R. Pfaff; T. Yokoyama; J. Y. Liu

  ANNALES GEOPHYSICAE, 2008, Peer-reviewed

  
• Plasma blobs and irregularities concurrently observed by ROCSAT-1 and Equatorial Atmosphere Radar

  Yokoyama, T.; Su, S.-Y.; Fukao, S.

  Journal of Geophysical Research: Space Physics, 25 May 2007, Peer-reviewed

  
• Lower E region field-aligned irregularities studied using the Equatorial Atmosphere Radar and meteor radar in Indonesia

  A. K. Patra; T. Yokoyama; M. Yamamoto; T. Nakamura; T. Tsuda; S. Fukao

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Jan. 2007, Peer-reviewed

  
• Upwelling backscatter plumes in growth phase of equatorial spread F observed with the Equatorial Atmosphere Radar

  T Yokoyama; S Fukao

  GEOPHYSICAL RESEARCH LETTERS, Apr. 2006, Peer-reviewed

  
• Eastward traverse of equatorial plasma plumes observed with the Equatorial Atmosphere Radar in Indonesia

  S. Fukao; T. Yokoyama; T. Tayama; M. Yamamoto; T. Maruyama; S. Saito

  ANNALES GEOPHYSICAE, 2006, Peer-reviewed

  
• Ionospheric irregularities in the low-latitude valley region observed with the Equatorial Atmosphere Radar

  T Yokoyama; AK Patra; S Fukao; M Yamamoto

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Oct. 2005, Peer-reviewed

  
• Disruption of E region echoes observed by the EAR during the development phase of equatorial spread F: A manifestation of electrostatic field coupling

  AK Patra; T Yokoyama; M Yamamoto; S Saito; T Maruyama; S Fukao

  GEOPHYSICAL RESEARCH LETTERS, Sep. 2005, Peer-reviewed

  
• Numerical simulation of mid-latitude ionospheric E-region based on SEEK and SEEK-2 observations

  T Yokoyama; M Yamamoto; S Fukao; T Takahashi; M Tanaka

  ANNALES GEOPHYSICAE, 2005, Peer-reviewed

  
• Electric field measurements of DC and long wavelength structures associated with sporadic-E layers and QP radar echoes

  R Pfaff; H Freudenreich; T Yokoyama; M Yamamoto; S Fukao; H Mori; S Ohtsuki; N Iwagami

  ANNALES GEOPHYSICAE, 2005, Peer-reviewed

  
• Modulation of the midlatitude ionospheric E region by atmospheric gravity waves through polarization electric field

  T Yokoyama; T Horinouchi; M Yamamoto; S Fukao

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Dec. 2004, Peer-reviewed

  
• Relationship of the onset of equatorial F region irregularities with the sunset terminator observed with the Equatorial Atmosphere Radar

  T Yokoyama; S Fukao; M Yamamoto

  GEOPHYSICAL RESEARCH LETTERS, Dec. 2004, Peer-reviewed

  
• Spatial relationship of equatorial plasma bubbles and field-aligned irregularities observed with an all-sky airglow imager and the Equatorial Atmosphere Radar

  Y Otsuka; K Shiokawa; T Ogawa; T Yokoyama; M Yamamoto; S Fukao

  GEOPHYSICAL RESEARCH LETTERS, Oct. 2004, Peer-reviewed

  
• First observations of the spatial structure of F region 3-m-scale field-aligned irregularities with the Equatorial Atmosphere Radar in Indonesia

  S Fukao; Y Ozawa; T Yokoyama; M Yamamoto; RT Tsunoda

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Feb. 2004, Peer-reviewed

  
• Three-dimensional simulation on generation of polarization electric field in the midlatitude E-region ionosphere

  T Yokoyama; M Yamamoto; S Fukao; RB Cosgrove

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Jan. 2004, Peer-reviewed

  
• Computer simulation of polarization electric fields as a source of midlatitude field-aligned irregularities

  T Yokoyama; M Yamamoto; S Fukao

  JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Feb. 2003, Peer-reviewed

  

Misc.

• Automatic detection and statistical analysis of sporadic E layer by machine learning using Shigaraki ionosonde observation

  横山竜宏; 采山裕紀; LIU Peng; 山本衛

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• 赤道ファウンテン

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• Study of coupling processes in the solar-terrestrial system=Current status in 2021=

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  日本地球惑星科学連合大会予稿集(Web), 2021

  
• 超高層大気分野研究の将来計画における観測ロケット実験—Sounding rocket experiment in the future plan of the uppter atmospheric research

  齊藤, 昭則; 坂崎, 貴俊; 阿部, 琢美; 横山, 竜宏; 西山, 尚典; 高橋, 透; SAITO, Akinori; SAKAZAKI, Takatoshi; ABE, Takumi; YOKOYAMA, Tatsuhiro; NISHIYAMA, Noritoshi; TAKAHASHI, Toru

  観測ロケットシンポジウム2022 講演集 = Proceedings of Sounding Rocket Symposium 2022, Mar. 2023

  
• Solar and geomagnetic activity dependence of 150-km echoes observed by the Equatorial Atmosphere Radar in Indonesia

  Tatsuhiro Yokoyama; Rieko Takagi; Mamoru Yamamoto

  Earth, Planets and Space, Dec. 2022

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• Long-term analysis of electron density observed by the MU radar and auto-scaled ionosonde data

  横山竜宏; 増田秀人; LIU Peng; 山本衛

  日本地球惑星科学連合大会予稿集(Web), 2022

  
• Long-term statistical analysis of electron density observed by the MU radar and comparison with 3-D tomography with GPS-TEC

  増田秀人; 横山竜宏; SSESSANGA Nicholas; 山本衛; 斎藤享

  日本地球惑星科学連合大会予稿集(Web), 2021

  
• Study of ionospheric E-region irregularities by Equatorial Atmosphere Radar during annular solar eclipse

  横山竜宏; 高木理絵子; 山本衛; 穂積コンニャナット; 垰千尋; 品川裕之

  日本地球惑星科学連合大会予稿集(Web), 2021

  
• Development of multi-scale numerical simulation model for the study on ionospheric disturbances

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  日本地球惑星科学連合大会予稿集(Web), 2021

  
• Bacillus属菌株由来MSK103プロテアーゼによるスクレイピープリオンの不活化:ウェスタンブロッティング,PMCA法およびバイオアッセイによる評価

  吉岡都; 村山裕一; 三輪岳宏; 三浦克洋; 高田竜宏; 横山隆; 西澤耕治; 毛利資郎

  日本獣医学会学術集会講演要旨集, 2007

  
• Integration of high-resolution plasma bubble model and whole atmosphere-ionosphere model

  横山 竜宏; 陣 英克; 品川 裕之; 劉 鵬

  京都大学電波科学計算機実験共同利用研究成果報告書 (KDK Research Report), Mar. 2023

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• 昼間スポラディックE層形成過程の中性大気とプラズマ大気の同時観測による解明—Elucidation of the generation process of daytime sporadic E Layers by simultaneous observation of the neutral and ionized atmospheres

  齊藤, 昭則; 阿部, 琢美; 松岡, 彩子; 石坂, 圭吾; 齋藤, 義文; 田川, 雅人; 熊本, 篤志; 斎藤, 享; 西岡, 未知; 細川, 敬祐; 横山, 竜宏; HUIXIN, Liu; SAITO, Akinori; ABE, Takumi; MATSUOKA, Ayako; ISHISAKA, Keigo; SAITO, Yoshifumi; TAGAWA, Masato; KUMAMOTO, Atsushi; SAITO, Susumu; NISHIOKA, Michi; HOSOKAWA, Keisuke; YOKOKAWA, Tatsuhiro

  観測ロケットシンポジウム2021 講演集 = Proceedings of Sounding Rocket Symposium 2021, Mar. 2022

  
• 電離圏の泡 : プラズマバブル

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  JGL = 日本地球惑星科学連合ニュースレター : Japan geoscience letters / 広報・アウトリーチ委員会 編, Aug. 2021

  
• 昼間スポラディックE層形成過程の中性大気とプラズマ大気の同時観測による解明

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  観測ロケットシンポジウム2020 講演集 = Proceedings of Sounding Rocket Symposium 2020, Mar. 2021

  
• 電離圏局所シミュレーション—Ionospheric High-resolution Simulation—宇宙環境計測・予測技術特集 ; 電離圏研究

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  情報通信研究機構研究報告 / 情報通信研究機構広報部 編, 2021

  
• Statistical analysis of Medium Scale Traveling Ionospheric Disturbances over Japan based on machine learning

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  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2021

  
• Long-term analysis of electron density observed by the MU radar and auto-scaled ionosonde data

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• Study of coupling processes in the solar-terrestrial system=Current status in 2020=

  YAMAMOTO Mamoru; HASHIGUCHI Hiroyuki; YOKOYAMA Tatsuhiro; MIYAOKA Hiroshi; OGAWA Yasunobu; SHIOKAWA Kazuo; NOZAWA Satonori; YOSHIKAWA Akimasa; TSUDA Toshitaka

  日本地球惑星科学連合大会予稿集(Web), 2020

  
• Ionospheric observations by Equatorial Atmosphere Radar during annular eclipse in December 2019

  高木理絵子; 横山竜宏; 山本衛; HOZUMI Kornyanat

  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2020

  
• Effect of rapidly growing equatorial plasma bubbles on midlatitude region

  横山竜宏; 品川裕之; 陣英克; 大塚雄一

  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2020

  
• Upgrade of equatorial plasma bubble simulation toward coupling with GAIA model.

  古元泰地; 横山竜宏

  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2020

  
• Ionospheric observations by Equatorial Atmosphere Radar during annular eclipse in December 2019

  高木理絵子; 横山竜宏; 山本衛; 穂積コンニャナット

  日本地球惑星科学連合大会予稿集(Web), 2020

  
• Upgrade of equatorial plasma bubble simulation toward coupling with GAIA model

  古元泰地; 横山竜宏; 品川裕之

  日本地球惑星科学連合大会予稿集(Web), 2020

  
• Long-term statistical analysis of the ionospheric observation with the MU radar

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  日本地球惑星科学連合大会予稿集(Web), 2020

  
• Effect of equatorial plasma bubbles on midlatitude region

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  日本地球惑星科学連合大会予稿集(Web), 2020

  
• A diagnosis of the Earth-space interface

  横山竜宏

  生存圏研究, 2020

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• Status of Equatorial MU Radar project in 2019

  M. Yamamoto; H. Hashiguchi; T. Yokoyama; T. Tsuda

  日本地球惑星科学連合2019年大会, May 2019

  
• あらせ(ERG)で観測されたヘクトメータ線スペクトルの励起源と波動特性

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• 高解像度シミュレーションによるプラズマバブル内部構造の発達と減衰過程

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• 太陽地球系結合過程の研究基盤形成

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  日本地球惑星科学連合大会予稿集(Web), 2019

  
• GAIAを用いた赤道プラズマバブルの発生・成長を支配するパラメータの解析

  品川裕之; 陣英克; 三好勉信; 藤原均; 横山竜宏; 大塚雄一

  日本地球惑星科学連合大会予稿集(Web), 2019

  
• Role of the pre-reversal enhancement and medium-scale gravity waves on multiple plasma bubbles occurrence

  Prayitno Abadi; Yuichi Otsuka; Kazuo Shiokawa; Mamoru Yamamoto; Huixin Liu; Tatsuhiro Yokoyama

  日本地球惑星科学連合2018年大会, May 2018

  
• 熱圏鉛直風によるプラズマバブルシーディング

  横山竜宏; 陣英克; 品川裕之

  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2018

  
• 数値シミュレーションと赤道大気レーダー観測によるプラズマバブル上昇速度の推定

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  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2017

  
• GAIAを用いたプラズマバブル発生予測について

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  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2017

  
• GAIAシミュレーションデータを用いたプラズマバブル発生確率の推定

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  日本地球惑星科学連合大会予稿集(Web), 2016

  
• 赤道プラズマバブルに伴う磁場変動の数値シミュレーション

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  日本地球惑星科学連合大会予稿集(Web), 2016

  
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  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2016

  
• GAIAの長期シミュレーションデータから推定するプラズマバブル発生特性

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  地球電磁気・地球惑星圏学会総会及び講演会(Web), 2016

  
• 新・衛星＝地上ビーコン観測と赤道大気レーダーによる低緯度電離圏の時空間変動の解明 －新しい研究プロジェクト紹介 －

  山本衛; 橋口浩之; 斎藤昭則; 松永真由美; 斎藤亨; Huixin Liu; 横山竜宏; 陣英克・Rola; Tsunoda・Tung-Yuan Hsiao

  第9回MUレーダー・赤道大気レーダーシンポジウム報告書, Sep. 2015

  
• 高精細プラズマバブルシミュレーションと全球大気圏電離圏モデルの結合

  横山竜宏; 陣英克; 品川裕之; 三好勉信; 藤原均

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2015

  
• GAIAを用いたプラズマバブル出現確率予測

  品川裕之; 陣英克; 三好勉信; 藤原均; 横山竜宏

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2015

  
• 観測ロケット実験による電離圏E‐F領域相互作用の解明

  山本衛; 加藤寛大; 石坂圭吾; 横山竜宏; 岩上直幹; 高橋隆男; 田中真; 遠藤研; 熊本篤志; 渡部重十; 山本真行; 阿部琢美; 羽生宏人; 斎藤享; 津川卓也; 西岡未知; BERNHARDT Paul; LARSENRSEN Miguel

  大気圏シンポジウム・講演集(Web), 2014

  
• 電離圏E‐F領域結合に関する数値シミュレーション

  横山竜宏

  大気圏シンポジウム・講演集(Web), 2014

  
• SEALION観測データを用いた,赤道エレクトロジェット,日没付近の赤道電場増加,赤道スプレッドF出現についての相関解析(2)

  国武学; 横山竜宏; 石橋弘光; 近藤巧; 山本和憲; THANH Le Truong; CHAU Ha Duyen; 塩川和夫

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2014

  
• GAIAを用いたスポラディックE層及びプラズマバブルの発生予測

  品川裕之; 陣英克; 三好勉信; 藤原均; 横山竜宏

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2014

  
• 高精細数値モデルによるプラズマバブルの非線形成長過程

  横山竜宏; 品川裕之; 陣英克

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2014

  
• Midnight Brightness Waveに伴う低緯度電離圏・熱圏の磁気共役点観測

  福島大祐; 塩川和夫; 大塚雄一; 久保田実; 横山竜宏; 西岡未知; KOMONJINDA Siramas; YATINI Clara

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2014

  
• 南北両半球結合数値モデルを用いた中規模伝搬性電離圏擾乱(MSTID)の研究

  横山竜宏

  大気圏シンポジウム・講演集(Web), 2013

  
• 観測ロケットS‐520‐27号機による中規模伝搬性電離圏擾乱に関する電界観測

  加藤寛大; 石坂圭吾; 横山竜宏; 山本衛

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2013

  
• 中規模伝搬性電離圏擾乱(MSTID)のスケール依存性と波面形成に関する数値実験

  横山竜宏

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2013

  
• S‐520‐27号機観測ロケットによる電離圏中の電場観測

  石坂圭吾; 大野恭平; 山本衛; 加藤寛大; 横山竜宏

  電気関係学会北陸支部連合大会講演論文集(CD-ROM), 2013

  
• Drift velocities of 150-km Field-Aligned Irregularities observed by the Equatorial Atmosphere Radar

  大塚雄一; 水谷徳仁; 水谷徳仁; 塩川和夫; PATRA Amit; 横山竜宏; 山本衛

  南極資料, 2013

  
• 観測ロケットS‐520‐26号機から地上までのビーコン実験結果速報

  山本衛; BERNHARDT Paul; WILKENS Matthew; 横山竜宏

  大気圏シンポジウム・講演集(Web), 2012

  
• 電離圏プラズマバブルの光学・電波観測

  大塚雄一; 塩川和夫; 小川忠彦; 山本衛; 横山竜宏

  大気圏シンポジウム・講演集(Web), 2012

  
• 南北両半球結合数値モデルを用いた中規模伝搬性電離圏擾乱(MSTID)の研究

  横山竜宏

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2012

  
• ロケットと地上からの複合観測による中緯度電離圏の観測

  山本衛; 阿部琢美; 渡部重十; 齊藤昭則; 大塚雄一; 横山竜宏; 山本真行; BERNHARDT. Paul A; LARSEN Miguel; PFAFF Robert F

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2011

  
• 赤道大気レーダーで昼間に観測された高度150kmの沿磁力線不規則構造の統計解析

  水谷徳仁; 大塚雄一; 塩川和夫; 横山竜宏; 山本衛; PATRA A.K; 丸山隆; 石井守

  大気圏シンポジウム・講演集(Web), 2010

  
• 赤道大気レーダーで昼間に観測された高度150km沿磁力線不規則構造の統計解析

  水谷徳仁; 大塚雄一; 塩川和夫; 横山竜宏; 山本衛; PATRA Amit K; 丸山隆; 石井守

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2009

  
• 赤道大気レーダーで昼間に観測された高度150kmの沿磁力線不規則構造

  水谷徳仁; 大塚雄一; 塩川和夫; 横山竜宏; 山本衛; PATRA A. K; 丸山隆; 石井守

  大気圏シンポジウム・講演集(Web), 2009

  
• 中緯度電離圏E‐F領域結合数値モデルによる北西‐南東波面構造の形成

  横山竜宏; HYSELL David L; 大塚雄一; 山本衛

  大気圏シンポジウム・講演集(Web), 2009

  
• Spatial relationship of F-region field-aligned irregularities and medium-scale traveling ionospheric disturbances observed with the MU radar and all-sky airglow imagers

  Otsuka Y; Shiokawa K; Ogawa T; Yokoyama T; Yamamoto M

  ICCAS-SICE 2009 - ICROS-SICE International Joint Conference 2009, Proceedings, 2009, Peer-reviewed

  
• 赤道大気レーダーで昼間に観測された高度150km沿磁力線不規則構造

  水谷徳仁; 大塚雄一; 塩川和夫; 横山竜宏; 山本衛; PATRA Amit K

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2008

  
• インドネシアにおける沿磁力線不規則構造のVHFレーダー観測

  大塚雄一; 小川忠彦; 横山竜宏; 山本衛; EFFENDY; PATRA

  大気圏シンポジウム, 2008

  
• EAR 関連観測で明らかとなった赤道プラズマバ ブルの時間・空間構造

  深尾昌一郎; 横山竜宏; 大塚雄一; 山本衛

  第2 回赤道大気レーダーシンポジウムプロシーディング， 2008/9/25-26, 京都, 131-138, 2009, 2008, Peer-reviewed

  
• 中緯度電離圏E‐F領域結合とPerkins不安定に関する3次元数値シミュレーション

  横山竜宏; 大塚雄一; 小川忠彦

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2007

  
• F領域沿磁力線不規則構造と中規模伝搬性電離圏擾乱のレーダー・光学同時観測

  大塚雄一; 横山竜宏; 塩川和夫; 小川忠彦; 齋藤昭則; 山本衛

  大気圏シンポジウム, 2007

  
• 中緯度電離圏E‐F領域結合に関する数値シミュレーション

  横山竜宏; 小川忠彦; 大塚雄一

  大気圏シンポジウム, 2006

  
• レーダーとGPS‐TEC観測に基づく電離圏E・F領域の電磁気的相互作用に関する研究

  前川暁紀; 横山竜宏; 山本衛; 斉藤昭則; 深尾昌一郎

  大気圏シンポジウム, 2006

  
• 赤道大気レーダーとSEALION観測に基づく低緯度電離圏E領域F領域の関連に関する研究

  河村高道; 山本衛; 深尾昌一郎; 丸山隆; 斎藤亨; 横山竜宏

  大気圏シンポジウム, 2006

  
• 赤道大気レーダーと 流星レーダーを用いた電離圏イレギュラリティと下部熱圏風速の比較

  横山竜宏; Amit K. Patra; 山本衛; 中村卓司; 津田敏隆; 深尾昌一郎

  「赤道大気上下結合」平成18年度公開ワークショップ集録,2006/9/14-15, 京都市, 51-54,2006, 2006, Peer-reviewed

  
• FERIXキャンペーン(F and E Region Ionosphere Coupling Experiment)MUレーダーと可搬型VHFレーダーの同時観測による中緯度E‐F領域結合過程の研究

  前川暁紀; 横山竜宏; 山本衛; 深尾昌一郎; 斉藤昭則

  大気圏シンポジウム, 2005

  
• 赤道大気レーダーを用いた低緯度電離圏FAIの空間分布に関する研究

  多山哲郎; 横山竜宏; 山本衛; 深尾昌一郎

  大気圏シンポジウム, 2005

  
• 低緯度電離圏イレギュラリティの発生時刻と日没時刻との関係

  横山竜宏; 深尾昌一郎; 山本衛

  大気圏シンポジウム, 2005

  
• Multilayer structure of mid-latitude Sporadic-E observed during the SEEK-2 campaign

  Wakabayashi, M; T. Ono; M. Yamamoto; T. Yokoyama; M. F. Larsen

  Ann. Geophys., 2005

  
• MUレーダー干渉計観測に基づく電離圏E領域イレギュラリティの時間空間構造に関する研究

  前川暁紀; 山本衛; 横山竜宏; 丸本雅人; 深尾昌一郎

  大気圏シンポジウム, 2004

  
• 赤道大気レーダー多ビーム観測による低緯度電離圏イレギュラリティの研究

  多山哲郎; 横山竜宏; 山本衛; 深尾昌一郎

  大気圏シンポジウム, 2004

  
• 大気重力波による中緯度電離圏E領域の変動に関する数値シミュレーション

  横山竜宏; 堀之内武; 山本衛; 深尾昌一郎

  大気圏シンポジウム, 2004

  
• Research of sporadic E layer space structure based on the continuous launch observation of S-310-31/32 rocket. SEEK-2 report.

  山本衛; 横山竜宏; 深尾昌一郎; 早川基

  宇宙科学シンポジウム 平成14年度 第3回, 2003

  
• SEEK‐2観測に基づくスポラディックE層の構造に関する研究

  山本衛; 深尾昌一郎; 横山竜宏; 斎藤享; LARSEN M F; BERNHARDT P A; PFAFF R A; TSUNODA R T; 早川基

  大気圏シンポジウム, 2003

  
• スポラディックE層に伴う分極電界の生成に関する研究

  横山竜宏; 山本衛; 深尾昌一郎

  大気圏シンポジウム, 2003

  
• 中緯度電離圏イレギュラリティの生成に関する3次元計算機シミュレーション

  横山竜宏; 山本衛; 深尾昌一郎

  大気圏シンポジウム, 2002

  
• 計算機シミュレーションによる中緯度電離圏イレギュラリティの生成に関する研究

  横山竜宏; 山本衛; 深尾昌一郎

  大気圏シンポジウム, 2001

  
• Observations of Ionospheric irregularity by The Equatorial Atmosphere Radar

  小澤雄一郎; 山本衛; 橋口浩之; 横山竜宏; 深尾昌一郎

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2001

  
• 3-dimensional numerical simulation of field-aligned irregurarities in midlatitude E-region

  横山竜宏; 山本衛; 深尾昌一郎

  地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM), 2001

  
• 可搬型ドップラーレーダーを用いたアメリカ西海岸における電離圏E領域イレギュラリティの観測

  横山竜宏; 山本衛; 深尾昌一郎; TSUNODA R T

  大気圏シンポジウム, 2000

  
• Behavior of ionosphere E region irregularity near the U.S.A. West Coast.

  横山竜宏; 山本衛; 斉藤昭則; 深尾昌一郎

  大気圏シンポジウム, 1998

  

Presentations

• トンガ沖海底火山噴火に伴う電離圏擾乱の研究

  横山 竜宏; 水澤 匠; 品川 裕之

  2024年度RISH電波科学計算機実験シンポジウム, Mar. 2025

  
• 信楽イオノゾンデ観測の自動読み取りシステムとfoF2の長期統計解析

  横山 竜宏; 劉 鵬; 釆山 裕紀; 寺内充

  第18回MUレーダー・赤道大気レーダーシンポジウム, Sep. 2024

  
• 赤道プラズマバブルの生成機構解明と発生予測に向けた研究

  横山 竜宏

  2023年度名古屋大学HPC計算科学連携研究プロジェクト成果報告会, Jul. 2024

  
• 赤道プラズマバブルの生成機構解明と発生予測に向けた研究

  横山 竜宏

  2022年度名古屋大学HPC計算科学連携研究プロジェクト成果報告会, Jul. 2023

  
• 赤道プラズマバブルの生成機構解明と発生予測に向けた研究

  横山 竜宏

  2021年度名古屋大学HPC計算科学連携研究プロジェクト成果報告会, Jul. 2022

  
• 赤道プラズマバブルの生成機構解明と発生予測に向けた研究

  横山 竜宏

  2020年度名古屋大学HPC計算科学連携研究プロジェクト成果報告会, Jul. 2021

  
• Simulation of Day-to-day Variability of Equatorial Plasma Bubbles Under Various Background Conditions

  Yokoyama, T; T. Yutani

  Asia Oceania Geosciences Society 21th Annual Meeting, Jun. 2024, Invited

  
• Simulation of Day-to-day Variability of Equatorial Plasma Bubbles Under Various Background Conditions

  Yokoyama, T; T. Yutani

  JPGU Meeting 2024, May 2024

  
• Study of ionospheric E-F region coupling by the long-term MU radar observation

  Yokoyama, T; R. Morishita; M. Yamamoto

  JPGU Meeting 2024, May 2024

  
• Incoherent Scatter Observations by the MU Radar over Japan: Potential Contribution to the IRI Model

  Yokoyama, T; M. Yamamoto; Y. Otsuka

  XXXVth International Union of Radio Science General Assembly and Scientific Symposium, Aug. 2023, Invited

  
• Multi-Scale Simulation of Equatorial Plasma Bubbles with GAIA Model

  Yokoyama, T; H. Jin; H. Shinagawa

  XXXVth International Union of Radio Science General Assembly and Scientific Symposium, Aug. 2023, Invited

  
• Solar and Geomagnetic Activity Dependence of 150-km Echoes Observed by the Equatorial Atmosphere Radar in Indonesia

  Yokoyama, T; R. Takagi; M. Yamamoto

  Asia Oceania Geosciences Society 20th Annual Meeting, Aug. 2023, Invited

  
• Automatic scaling of foF2 and foEs from ionograms obtained at Shigaraki MU Observatory

  Yokoyama, T; Y. Uneyama; P. Liu; M. Yamamoto

  Asia Oceania Geosciences Society 20th Annual Meeting, Aug. 2023

  
• 信楽イオノゾンデ観測を用いた機械学習によるスポラディックE層の自動検出と統計解析

  横山 竜宏; 采山 裕紀; 劉 鵬; 山本 衛

  日本地球惑星科学連合2023年大会, May 2023

  
• 赤道大気レーダーで観測された150kmエコーの太陽・地磁気活動依存性

  横山 竜宏; 高木 理絵子; 山本 衛

  第152回 地球電磁気・地球惑星圏学会講演会, Nov. 2022

  
• 赤道大気レーダーで観測された150kmエコーの太陽・地磁気活動依存性

  横山 竜宏; 高木 理絵子; 山本 衛

  第16回MUレーダー・赤道大気レーダーシンポジウム, Sep. 2022

  
• Long-term Statistical Analysis of Ionospheric Irregularities Observed by the MU Radar and Equatorial Atmosphere Radar

  Yokoyama, T; T. Ishii; T. Yutani; M. Yamamoto

  Asia Oceania Geosciences Society 19th Annual Meeting, Aug. 2022

  
• MUレーダーと赤道大気レーダーによる電離圏イレギュラリティ観測の長期統計解析

  横山 竜宏; 石井 達也; 湯谷 樹生; 山本 衛

  日本地球惑星科学連合2022年大会, Jun. 2022

  
• MUレーダー観測とイオノゾンデ自動読み取りシステムを用いた電子密度の長期統計解析

  横山 竜宏; 増田 秀人; 劉 鵬; 山本 衛

  日本地球惑星科学連合2022年大会, Jun. 2022

  
• Development of Multi-scale Numerical Simulation Model for the Study on Ionospheric Disturbances

  Yokoyama, T; T. Komoto

  Asia Oceania Geosciences Society 18th Annual Meeting, Aug. 2021

  
• Nighttime MSTIDs and coupling with sporadic-E layers

  Yokoyama, T

  2019 AGU Fall Meeting, Dec. 2019, Invited

  
• Seeding, structuring, and decaying of equatorial plasma bubbles simulated by high-resolution bubble (HIRB) model

  Yokoyama, T; H. Jin; H. Shinagawa; C. L. Rino; C. S. Carrano

  2019 AGU Fall Meeting, Dec. 2019, Invited

  
• Equatorial ionospheric disturbances and its social impact

  Yokoyama, T

  The 9th International Symposium for Sustainable Humanosphere, Oct. 2019, Invited

  
• High-Resolution Simulation Studies of Equatorial Plasma Bubbles

  Yokoyama, T

  2019 URSI-Japan Radio Science Meeting, Sep. 2019

  
• Seeding, structuring, and decaying of equatorial plasma bubbles simulated by high-resolution bubble (HIRB) model

  Yokoyama, T

  The 2nd EPB workshop: STERN Workshop on Scientific Challenges in Ionospheric Plasma Bubble Forecasting, Sep. 2019, Invited

  
• Recent results of high resolution plasma bubble modeling

  Yokoyama, T

  15th International Symposium on Equatorial Aeronomy, Oct. 2018, Invited

  
• Spectral characteristics of equatorial plasma bubbles simulated by High Resolution Bubble model

  Yokoyama, T; C. L. Rino; C. S. Carrano

  Asia Oceania Geosciences Society 15th Annual Meeting, Jun. 2018, Invited

  
• Neutral wind effects on equatorial plasma bubbles simualted by High Resolution Bubble model

  Yokoyama, T; H. Jin; H. Shinagawa

  Asia Oceania Geosciences Society 15th Annual Meeting, Jun. 2018, Invited

  
• Vertical rise velocity of equatorial plasma bubbles estimated from Equatorial Atmosphere Radar observations and High-Resolution Bubble model simulations

  Yokoyama, T; S. Tulasi Ram; K. K. Ajith; M. Yamamoto; K. Niranjan

  2017 AGU Fall Meeting, Dec. 2017

  
• Spectral analysis of equatorial plasma bubbles obtained by high-resolution bubble model and C/NOFS satellite

  Yokoyama, T; C. L. Rino; C. S. Carrano; K. M. Groves; P. A. Roddy

  XXXIInd International Union of Radio Science General Assembly and Scientific Symposium, Aug. 2017, Invited

  
• Sub-kilometer simulation of equatorial plasma bubble and comparision with satellite observations

  Yokoyama, T; R. F. Pfaff; C. Stolle; S.-Y. Su

  2016 AGU Fall Meeting, Dec. 2016

  
• Numerical simulation of magnetic field variation associated with equatorial plasma bubble

  Yokoyama, T; C. Stolle

  2016 URSI Asia-Pacific Radio Science Conference, Aug. 2016, Invited

  
• Scale Dependence of MSTID: Perkins Instability and Es Layer Seeding

  Yokoyama, T

  2014 AGU Fall Meeting, Dec. 2014, Invited

  
• Importance of E-F Region Coupling on Low and Mid-Latitude Ionospheric Irregularities

  Yokoyama, T

  2014 AGU Fall Meeting, Dec. 2014, Invited

  
• Three-dimensional high-resolution plasma bubble modeling

  Yokoyama, T; H. Shinagawa; H. Jin

  Committee on Space Research 40th COSPAR Scientific Assembly, Aug. 2014

  
• Three-dimensional high-resolution plasma bubble modeling

  Yokoyama, T; H. Shinagawa; H. Jin

  Asia Oceania Geosciences Society 11th Annual General Meeting, Jul. 2014

  
• Hemisphere-coupled numerical model for medium-scale traveling ionospheric disturbances

  Yokoyama, T

  2012 AGU Fall Meeting, Dec. 2012, Invited

  
• Numerical modeling of medium-scale traveling ionospheric disturbances (MSTIDs) seeded by sporadic-E layers

  Yokoyama, T

  The 13th International Symposium on Equatorial Aeronomy, Mar. 2012, Invited

  
• Equatorial spread F and coupled low-latitude ionosphere studied by the Equatorial Atmosphere Radar

  Yokoyama, T; S. Fukao

  International Union of Geodesy and Geophysics XXIV General Assembly, Jul. 2007, Invited

  

Books and Other Publications

• Earth's Magnetic Field

  Tatsuhiro Yokoyama; Claudia Stolle, Contributor, Low and midlatitude ionospheric plasma density irregularities and their effects on geomagnetic field

  Springer, Dec. 2017, Not refereed

  Find Kyoto University's collection of books :

  
• Aeronomy of the Earth's Atmosphere and Ionosphere

  Tatsuhiro Yokoyama, Contributor, Instabilities in the midlatitude ionosphere in terms of E-F coupling

  Springer, Mar. 2011, Not refereed

  Find Kyoto University's collection of books :

  

Awards

• 01 Jun. 2021

  Japan Geoscience Union, Nishida Prize for Promotion of Geo- and Planetary Science
• 17 Jul. 2012

  Committee on Space Research, Zeldovich Medal
• 30 Sep. 2007

  Society of Geomagnetism and. Earth, Planetary and Space Sciences, Obayashi Early Career Scientist Award
• 04 Feb. 2006

  Inoue Foundation for Science, Inoue Research Award for Young Scientists

External funds: Kakenhi

• Study of latitudinal coupling of upper atmospheric variations based on multi-point ground network observations

  Grant-in-Aid for Scientific Research (A)

  Medium-sized Section 17:Earth and planetary science and related fields

  Nagoya University

  塩川 和夫

  From 05 Apr. 2021, To 31 Mar. 2026, Granted

  超高層大気;緯度間結合;夜間大気光;電離圏;地上ネットワーク観測;宇宙科学;地球科学;オーロラ

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21H04518/
• Study of ionospheric disturbances by coupling of global and local ionospheric numerical models

  Grant-in-Aid for Scientific Research (C)

  Basic Section 17010:Space and planetary sciences-related

  Kyoto University

  横山 竜宏

  From 01 Apr. 2020, To 31 Mar. 2024, Granted

  電離圏;シミュレーション;プラズマバブル;GAIA

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20K04037/
• International study of equatorial ionosphere based on observations and models

  Grant-in-Aid for Scientific Research (A)

  Medium-sized Section 17:Earth and planetary science and related fields

  Kyoto University

  山本 衛

  From 01 Apr. 2020, To 31 Mar. 2025, Granted

  赤道プラズマバブル;レーダー観測;GPS-TEC観測;衛星データ解析;全地球大気モデル;GNSS-TEC観測

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H00197/
• Ionospheric irregularities in low-mid latitudes and effects over Japanese ionosphere

  Grant-in-Aid for Young Scientists (B)

  Kyoto University;National Institute of Information and Communications Technology

  Tatsuhiro Yokoyama

  From 01 Apr. 2016, To 31 Mar. 2020, Project Closed

  電離圏;プラズマバブル;MSTID;シミュレーション;シンチレーション;超高層物理学;磁気圏・電離圏;自然現象観測・予測;計算物理

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16K17814/
• Study of spatio-temporal fluctuation of low latitude ionosphere by using new satellite-ground beacon observation and Equatorial Atmospheric Radar

  Grant-in-Aid for Scientific Research (A)

  Kyoto University

  Mamoru Yamamoto

  From 01 Apr. 2015, To 31 Mar. 2019, Project Closed

  地球惑星電離圏;赤道スプレッドF現象;ビーコン衛星;ディジタル受信機;多周波共用アンテナ

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15H02135/
• Study of relations between Equatorial Spread-F and ionospheric structures with Equatorial Atmosphere Radar and wide-area observation network

  Grant-in-Aid for Scientific Research (B)

  Kyoto University

  Mamoru Yamamoto

  From 01 Apr. 2013, To 31 Mar. 2017, Project Closed

  赤道スプレッドF現象;赤道大気レーダー;衛星ビーコン観測;アジア太平洋;国際共同研究

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25302007/
• Study of generation mechanism of middle-latitude ionospheric wave by rocket and ground-based observations

  Grant-in-Aid for Scientific Research (B)

  Kyoto University

  Mamoru YAMAMOTO

  From 01 Apr. 2012, To 31 Mar. 2015, Project Closed

  地球惑星電離圏;地球惑星上層大気;ロケット観測;地上観測;中規模伝搬性電離圏擾乱

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24340120/
• International joint research of geospace variability by combining multi-point ground and satellite observations and modeling

  Fund for the Promotion of Joint International Research (International Leading Research )

  Science and Engineering

  Nagoya University

  塩川 和夫

  From 20 Dec. 2022, To 31 Mar. 2029, Granted

  ジオスペース;宇宙天気予報;オーロラ;プラズマバブル;電離圏;宇宙科学;地球科学;地上観測ネットワーク

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K21345/

Education

Teaching subject(s)

• From 01 Apr. 2024, To 31 Mar. 2025

  Digital Signal Processing

  6061, Fall, Faculty of Engineering, 2
• From 01 Apr. 2024, To 31 Mar. 2025

  Atmospheric Measurement Techniques

  3683, Fall, Graduate School of Informatics, 2
• From 01 Apr. 2024, To 31 Mar. 2025

  Remote Sensing Engineering

  3646, Fall, Graduate School of Informatics, 2
• From 01 Apr. 2024, To 31 Mar. 2025

  Computational Methods and Exercise in Electrical and Electronic Engineering

  6080, Fall, Faculty of Engineering, 3
• From 01 Apr. 2023, To 31 Mar. 2024

  Introducion to Elecrical and Electronic Engineering

  6074, Fall, Faculty of Engineering, 2
• From 01 Apr. 2023, To 31 Mar. 2024

  Introduction to humanosphere science I

  Y203, Spring, Institute for Liberal Arts and Sciences, 2
• From 01 Apr. 2023, To 31 Mar. 2024

  Atmospheric Measurement Techniques

  3683, Fall, Graduate School of Informatics, 2
• From 01 Apr. 2023, To 31 Mar. 2024

  Remote Sensing Engineering

  3646, Fall, Graduate School of Informatics, 2
• From 01 Apr. 2023, To 31 Mar. 2024

  Computational Methods and Exercise in Electrical and Electronic Engineering

  6080, Fall, Faculty of Engineering, 3
• From 01 Apr. 2022, To 31 Mar. 2023

  Atmospheric Measurement Techniques

  3683, Fall, Graduate School of Informatics, 2
• From 01 Apr. 2022, To 31 Mar. 2023

  Introduction to humanosphere science I

  Y203, Spring, Institute for Liberal Arts and Sciences, 2
• From 01 Apr. 2022, To 31 Mar. 2023

  Introducion to Elecrical and Electronic Engineering

  6074, Fall, Faculty of Engineering, 2
• From 01 Apr. 2022, To 31 Mar. 2023

  Computational Methods and Exercise in Electrical and Electronic Engineering

  6080, Fall, Faculty of Engineering, 3
• From 01 Apr. 2022, To 31 Mar. 2023

  Remote Sensing Engineering

  3646, Fall, Graduate School of Informatics, 2
• From Apr. 2020, To Mar. 2021

  Atmospheric Measurement Techniques

  Fall, 情報学研究科
• From Apr. 2020, To Mar. 2021

  Remote Sensing Engineering

  Fall, 情報学研究科
• From Apr. 2020, To Mar. 2021

  Computational Methods and Exercise in Electrical and Electronic Engineering

  Fall, 工学部
• From Apr. 2021, To Mar. 2022

  Atmospheric Measurement Techniques

  Fall, 情報学研究科
• From Apr. 2021, To Mar. 2022

  Remote Sensing Engineering

  Fall, 情報学研究科
• From Apr. 2021, To Mar. 2022

  Computational Methods and Exercise in Electrical and Electronic Engineering

  Fall, 工学部

Student achievements: Awards

• Student Presentation Award

  Fu Weizheng, Society of Geomagnetism and Earth, Planetary and Space Sciences, 30 Nov. 2022

Student achievements: Papers

• Channel Mixer Layer: Multimodal Fusion Toward Machine Reasoning for Spatiotemporal Predictive Learning of Ionospheric Total Electron Content

  Liu, P., T. Yokoyama, T. Sori, and M. Yamamoto

  2024, Space Weather, 22, e2024SW004121, Peer-reviewed, English, Scientific journal, False

  https://doi.org/10.1029/e2024SW004121
• Investigation of the Occurrence Characteristics and Possible Origins of Daytime Spread F Irregularities in Low Latitude Region

  Lehui Wei, Chunhua Jiang, Tatsuhiro Yokoyama, Jing Liu, Guobin Yang, Yaogai Hu

  26 Dec. 2023, First Author, J. Geophys. Res. Space Physics, 129, Peer-reviewed, English, Scientific journal, True

  https://doi.org/10.1029/2023JA031809
• High-resolution 3-D imaging of daytime sporadic-E over Japan by using GNSS TEC and ionosondes

  Weizheng Fu, Nicholas Ssessanga, Tatsuhiro Yokoyama, Mamoru Yamamoto

  07 Dec. 2021, Space Weather, 19, e2021SW002878, Peer-reviewed, English, Scientific journal, True

  https://doi.org/10.1029/2021SW002878
• On using a double-thin-shell approach and TEC perturbation component to sound night-time mid-latitude E-F coupling

  Weizheng, Fu, Tatsuhiro Yokoyama, Nicholas Ssessanga, Mamoru Yamamoto, Peng Liu

  02 Jun. 2022, Earth, Planets and Space, 74, 83, Peer-reviewed, English, Scientific journal, True

  https://doi.org/10.1186/s40623-022-01639-w
• Nighttime Midlatitude E-F Coupling in Geomagnetic Conjugate Ionospheres: A Double Thin Shell Model and a Multi-Source Data Investigation

  Weizheng Fu, Tatsuhiro Yokoyama, Nicholas Ssessanga, Guanyi Ma, Mamoru Yamamoto

  14 Mar. 2023, J. Geophys. Res. Space Physics, 128, e2022JA031074, Peer-reviewed, English, Scientific journal, True

  https://doi.org/10.1029/2022JA031074
• Statistical analysis of medium-scale traveling ionospheric disturbances over Japan based on deep learning instance segmentation

  Peng Liu, Tatsuhiro Yokoyama, Weizheng Fu, Mamoru Yamamoto

  10 Jul. 2022, Space Weather, 20, 7, e2022SW003151, Peer-reviewed, English, Scientific journal, False

  https://doi.org/10.1029/2022SW003151

Student achievements: Presentations

• イオノゾンデ観測を用いた機械学習によるスポラディック E 層の統計解析と発生予測

  釆山 裕紀, 横山 竜宏, 劉 鵬

  地球電磁気・地球惑星圏学会2024年秋季年会, Nov. 2024, From Nov. 2024, Not invited, Oral presentation
• Multimodal Fusion Towards Machine Reasoning for Spatiotemporal Predictive Learning of Ionospheric Total Electron Content

  劉 鵬, 横山 竜宏, 惣宇利 卓弥, 山本 衛

  地球電磁気・地球惑星圏学会2024年秋季年会, Nov. 2024, From Nov. 2024, Not invited, Oral presentation
• Spatiotemporal Sequence Prediction of Global Ionospheric Total Electron Content Map Based on Machine Learning

  Liu, P., T. Yokoyama, and M. Yamamoto

  Committee on Space Research 45th COSPAR Scientific Assembly, 20 Jul. 2024, From 13 Jul. 2024, To 21 Jul. 2024, Not invited, English, Oral presentation
• 機械学習を用いた地球電離圏の全電子数マップの時空間系列予測

  劉 鵬、横山 竜宏、山本 衛

  日本地球惑星科学連合2024年大会, 29 May 2024, From 26 May 2024, To 31 May 2024, Not invited, English, Poster presentation
• The Occurrence Characteristics of Daytime Spread F in the Low Latitude Regions During 2013-2020 Observed by Puer Ionosonde

  Lehui Wei, Chunhua Jiang, and Tatsuhiro Yokoyama

  日本地球惑星科学連合2023年大会, 22 May 2023, From 21 May 2023, To 26 May 2023, Not invited, English, Poster presentation
• Three-dimensional Simulation of Equatorial Spread F: Effects of Field-aligned Plasma Flow and Ionospheric Conductivity

  Zezhong Li, Jiuhou Lei, Binzheng Zhang, and Tatsuhiro Yokoyama

  日本地球惑星科学連合2023年大会, 21 May 2023, From 21 May 2023, To 26 May 2023, Not invited, English, Oral presentation
• 深層学習再帰型ニューラルネットワークを用いた地球電離圏全電子数マップの時空間系列予測

  劉 鵬, 横山 竜宏, 山本 衛

  日本地球惑星科学連合2023年大会, 25 May 2023
• Spatiotemporal Sequence Prediction of Global Ionospheric Total Electron Content Map Based on Deep Learning Recurrent Neural Network

  Liu, P., T. Yokoyama, and M. Yamamoto

  XXXVth International Union of Radio Science General Assembly and Scientific Symposium, 24 Aug. 2023, Not invited
• Sounding of E-F coupling over Japan by using ground-based GNSS TEC with a double-thin-shell approach

  傅 維正, 横山 竜宏, Nicholas Ssessanga, 山本 衛

  日本地球惑星科学連合2022年大会, 25 May 2022, From 22 May 2022, To 27 May 2022, Not invited, English, Oral presentation
• Study of nighttime midlatitude E-F coupling in geomagnetic conjugate regions using multi-source data

  傅 維正, 横山 竜宏, Nicholas Ssessanga, 馬 冠一, 山本 衛

  第152回 地球電磁気・地球惑星圏学会講演会, 05 Nov. 2022, From 04 Nov. 2022, To 07 Nov. 2022, Not invited, Japanese, Oral presentation
• Statistical Analysis of Medium-scale Traveling Ionospheric Disturbances Over Japan Based on Deep Learning Instance Segmentation

  Liu, P., and Yokoyama, T.

  Asia Oceania Geosciences Society 19th Annual Meeting, 04 Aug. 2022, From 01 Aug. 2022, To 05 Aug. 2022, Not invited, English, Oral presentation
• 3-D Imaging of Nighttime E-F Coupling Over Japan by Using Groundbased GNSS-TEC and Ionosondes

  Fu, W., N. Ssessanga, T. Yokoyama, P. Liu, and M. Yamamoto

  16th International Symposium on Equatorial Aeronomy, 14 Sep. 2022, From 12 Sep. 2022, To 16 Sep. 2022, Not invited, English, Oral presentation

Part-time lecturer

• From 01 Apr. 2024, To 31 Mar. 2025

  ディジタル信号処理、電気電子計算工学及演習、特別研究

  後期３０時間、後期60時間、通年120時間 , 京都大学, 工学部
• From 01 Apr. 2023, To 31 Mar. 2024

  電気電子計算工学及演習、特別研究

  後期60時間、通年120時間, 京都大学, 工学部
• From 01 Apr. 2022, To 31 Mar. 2023

  電気電子計算工学及演習、特別研究

  後期60時間、通年120時間, 工学部

Administration

Faculty management (title, position)

• From 01 Apr. 2023, To 31 Mar. 2024

  生存圏研究所生存圏フォーラム委員会委員長
• From 01 Apr. 2022, To 31 Mar. 2024

  生存圏研究所MUレーダー/赤道大気レーダー共同利用・共同研究専門委員会
• From 01 Apr. 2022, To 31 Mar. 2024

  生存圏研究所安全衛生委員会
• From 01 Apr. 2022, To 31 Mar. 2024

  生存圏研究所学術交流委員会
• From 01 Apr. 2022, To 31 Mar. 2024

  生存圏研究所情報セキュリティ委員会
• From 01 Apr. 2022, To 31 Mar. 2023

  生存圏研究所生存圏フォーラム委員会
• From 01 Apr. 2022, To 31 Mar. 2024

  生存圏研究所通信情報委員会
• From 01 Apr. 2022, To 31 Mar. 2024

  生存圏研究所点検・評価委員会
• From 01 Apr. 2019, To 31 Mar. 2020

  生存圏研究所学術交流委員会
• From 01 Apr. 2019, To 31 Mar. 2020

  生存圏研究所生存圏フォーラム委員会
• From 01 Apr. 2020, To 02 Jun. 2020

  生存圏研究所MUﾚｰﾀﾞｰ/赤道大気ﾚｰﾀﾞｰ全国国際共同利用専門委員会
• From 01 Apr. 2020, To 31 Mar. 2022

  生存圏研究所学術交流委員会
• From 01 Apr. 2020, To 31 Mar. 2022

  生存圏研究所客員審査委員会
• From 01 Apr. 2020, To 31 Mar. 2022

  生存圏研究所生存圏フォーラム委員会
• From 03 Jun. 2020, To 31 Mar. 2022

  生存圏研究所MUﾚｰﾀﾞｰ/赤道大気ﾚｰﾀﾞｰ共同利用・共同研究拠点専門委員会
• From 01 Jan. 2021, To 31 Dec. 2021

  京都大学宇治キャンパス公開2021実行委員会

Academic, Social Contribution

Committee Memberships

• From Oct. 2023, To Present

  委員, 日本学術会議地球惑星科学委員会地球惑星科学国際連携分科会SCOSTEP-STPP小委員会
• From Nov. 2022, To May 2024

  EPS Lead Guest Editor for Special Issue (ISEA-16), SGEPSS
• From Jun. 2022, To Present

  Associate Editor, Frontiers in Astronomy And Space Sciences
• From Dec. 2021, To May 2022

  Review Editor, Frontiers in Astronomy and Space Sciences
• From Jan. 2018, To Dec. 2021

  Editorial board member of Earth Planets and Space, Society of Geomagnetism and. Earth, Planetary and Space Sciences
• From Apr. 2021, To Present

  -, Society of Geomagnetism and Earth, Planetary and Space Sciences
• From 01 Jan. 2018, To 30 Nov. 2020

  -, Society of Geomagnetism and Earth, Planetary and Space Sciences
• From 01 Dec. 2014, To 30 Nov. 2020

  -, Society of Geomagnetism and. Earth, Planetary and Space Sciences
• From Oct. 2020, To Mar. 2022

  Space and Planetary Sciences Section Board Member, Japan Geoscience Union
• From Jul. 2019, To Present

  ST Section Secretary, Asia Oceania Geosciences Society
• From May 2017, To Oct. 2018

  Associated Editor of Progress in Earth and Planetary Science, Japan Geoscience Union

Academic Contribution

• AOGS 2024 Session Convener

  Panel moderator

  Asia Oceania Geosciences Society, From 24 Jun. 2024, To 28 Jun. 2024

  
• XXXXVth URSI General Assembly and Scientific Symposium

  Panel moderator

  Union Radio-Scientifique Internationale, From 20 Aug. 2023, To 26 Aug. 2023

  
• AOGS 2023 Session Convener

  Panel moderator

  Asia Oceania Geosciences Society, From 30 Jul. 2023, To 04 Aug. 2023

  
• EGU23 General Assembly Session Convener

  Panel moderator

  European Geosciences Union, From 23 Apr. 2023, To 28 Apr. 2023

  
• AOGS 2022 Session Convener

  Panel moderator

  Asia Oceania Geosciences Society, From 01 Aug. 2022, To 05 Aug. 2022

  
• AOGS 2021 Session Convener

  Panel moderator

  Asia Oceania Geosciences Society, From 01 Aug. 2021, To 06 Aug. 2021

  
• 16th International Symposium on Equatorial Aeronomy

  Planning, management, etc., Panel moderator

  Kyoto University, From 12 Sep. 2022, To 16 Sep. 2022

  

Social Contribution

• -

  Other

  -, From 22 Mar. 2019, To 22 Mar. 2019

  
• -

  Other

  -, From 06 Mar. 2018, To 06 Mar. 2018

  
• -

  Other

  -, From 06 Mar. 2018, To 06 Mar. 2018

  
• -

  Other

  -, From Jan. 2018, To Jan. 2018

  
• -

  Other

  -, From 03 Aug. 2017, To 03 Aug. 2017