Study on formation process of radiation belts through relativistic acceleration of electrons by whistler-mode waves

2010 Fiscal Year Final Research Report

• Project/Area Number: 20340135
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Space and upper atmospheric physics
• Research Institution: Kyoto University
• Principal Investigator: OMURA Yoshiharu Kyoto University, 生存圏研究所, 教授 (50177002)
• Co-Investigator(Kenkyū-buntansha): KASAHARA Yoshiya 金沢大学, 総合メディア基盤センター, 准教授 (50243051)
• Co-Investigator(Renkei-kenkyūsha): USUI Hideyuki 神戸大学, 大学院・システム情報学研究科, 教授 (10243081)
• Project Period (FY): 2008 – 2010
• Keywords: プラズマ波動

Research Abstract

Chorus emissions are electromagnetic waves with rising-tone frequencies observed in the Earth's magnetosphere. Computer simulations of the wave-particle interaction show that waves grow to form coherent large amplitude waves, causing electron precipitation to the atmosphere. A fraction of the resonant electrons are accelerated to relativistic energy in a short time scale of a few hours. Generation of chorus emissions is a key process of radiation belt formation.

Research Products

• [Journal Article] 編隊飛行衛星による連携観測模擬実験システムの開発 (2011)
  • Author(s): 竹中悟, 笠原禎也, 小嶋浩嗣, 井町智彦
  • Journal Title: 電子情報通信学会論文誌 J94-B(7)(印刷中)
  • Peer Reviewed
• [Journal Article] Simultaneous ground-based and satellite observations of natural VLF waves in Antarctica : A case study of downward ionospheric penetration of whistler-mode waves (2010)
  • Author(s): M.Ozaki, S.Yagitani, I.Nagano, Y.Kasahara, H.Yamagishi, N.Sato, A.Kadokura
  • Journal Title: Polar Science(doi:10.1016/j.polar) 4(3) Pages: 431-441
  • Peer Reviewed
• [Journal Article] Self-consistent particle simulation of whistler mode triggered emissions (2010)
  • Author(s): M.Hikishima, Y.Omura, D.Summers
  • Journal Title: JOURNAL OF GEOPHYSICAL RESEARCH(doi : 10.1029/2010JA015860) VOL.115 Pages: A12246
  • Peer Reviewed
• [Journal Article] Theory and observation of electromagnetic ion cyclotron triggeredemissions in the magnetosphere (2010)
  • Author(s): Y.Omura, J.Pickett, B.Grison, O.Santolik, I.Dandouras, M.Engebretson, P.M.E.Decreau, A.Masson
  • Journal Title: JOURNAL OF GEOPHYSICAL RESEARC(doi : 10.1029/2010JA015300) VOL.115 Pages: A07234
  • Peer Reviewed
• [Journal Article] Cluster observations of EMIC triggered emissions in association with Pc1 waves near Earth's plasmapause (2010)
  • Author(s): J.S.Pickett, B.Grison, Y.Omura, M.J.Engebretson, I.Dandouras, A.Masson, M.L.Adrian, O.Santolik, P.M.E. Decreau, N.Cornilleau-Wehrlin, D.Constantinescu
  • Journal Title: Geophysical Research Letters(doi : 10.1029/2010GL042648) VOL.37 Pages: L09104
  • Peer Reviewed
• [Journal Article] Similar Data Retrieval from Enormous Datasets on ELF/VLF Wave Spectrum Observed by Akebono (2010)
  • Author(s): Y.Kasahara, A.Hirano, Y.Takata
  • Journal Title: Data Science Journal(doi : 10.2481/dsj.SS_IGY-002) Vol.8 Pages: IGY66-IGY75
  • Peer Reviewed
• [Journal Article] Microburst precipitation of energetic electrons associated with choruswave generation (2010)
  • Author(s): M.Hikishima, Y.Omura, Danny Summers
  • Journal Title: Geophysical Research Letters(doi : 10.1029/2010GL042678) VOL.37 Pages: L07103
  • Peer Reviewed
• [Journal Article] Coherent nonlinear scattering of energetic electrons in the process ofwhistler-mode chorus generation (2009)
  • Author(s): M.Hikishima, S.Yagitani, Y.Omura, I.Nagano
  • Journal Title: Journal of Geophysical Research(doi : 10.1029/2009JA014371)
  • Peer Reviewed
• [Journal Article] Nonlinear mechanisms of lower band and upper band VLF chorus emissionsin the magnetosphere (2009)
  • Author(s): Y.Omura, M. Hikishima, Y.Katoh, D.Summers, S.Yagitani
  • Journal Title: Journal Geophysical Research(doi : 10.1029/2009JA014206)
  • Peer Reviewed
• [Journal Article] Properties of dayside nonlinear rising tone emissions at large Lobserved by GEOTAIL (2009)
  • Author(s): O.P.Verkhoglyadova, B.T.Tsurutani, Y.Omura, S.Yagitani
  • Journal Title: Earth Planets Space 61 Pages: 625-628
  • Peer Reviewed
• [Journal Article] Simultaneous Satellite Observations of VLF Chorus, Hot and Relativistic Electrons in a Magnetic Storm "Recovery" Phase (2009)
  • Author(s): Y.Kasahara, Y.Miyoshi, Y.Omura, O.P.Verkhoglyadova, I.Nagano, I.Kimura, B.T.Tsurutani
  • Journal Title: Geophysical Research Letters(doi : 10.1029/2008GL036454) 36 Pages: L01106
  • Peer Reviewed
• [Journal Article] Full particle simulation of whistler-mode rising 1 chorus emissions in the magnetosphere (2009)
  • Author(s): M.Hikishima, S.Yagitani, Y.Omura, I.Nagano
  • Journal Title: Journal of Geophysical Research(doi : 10.1029/2008JA013625) 114 Pages: A01203
  • Peer Reviewed
• [Journal Article] Rapid energization of radiation belt electrons by nonlinear wave trapping (2008)
  • Author(s): Y.Katoh, Y.Omura, D.Summers
  • Journal Title: Ann.Geophys. 26 Pages: 3451-3456
  • Peer Reviewed
• [Journal Article] Relativistic turning acceleration of radiation belt electrons by whistler mode chorus (2008)
  • Author(s): N.Furuya, Y.Omura, D.Summer
  • Journal Title: Journal of Geophysical Research 113 Pages: A04224
  • Peer Reviewed
• [Journal Article] Theory and simulation of the generation of whistler-mode chorus (2008)
  • Author(s): Y.Omura, Y.Katoh, D.Summers
  • Journal Title: Journal of Geophysical Research(doi : 10.1029/2007JA012622) 113 Pages: A04223
  • Peer Reviewed
• [Journal Article] Amplitude dependence of frequency sweep rates of whistler-mode chorusemissions
  • Author(s): Y.Katoh Y.Omura
  • Journal Title: Journal of Geophysical Research in press
  • Peer Reviewed
• [Journal Article] Simulation of Electromagnetic Ion Cyclotron Triggered Emissions in the Earth's Inner Magnetosphere
  • Author(s): M.Shoji, Y.Omura
  • Journal Title: Journal of Geophysical Research in press
  • Peer Reviewed
• [Journal Article] Triggering process of whistler-mode chorus emissions in the magnetosphere
  • Author(s): Y.Omura, D.Nunn
  • Journal Title: Journal of Geophysical Research in press
  • Peer Reviewed
• [Presentation] Theory and Simulations on Whistler-mode and EMIC Triggered Emissions (2010)
  • Author(s): 大村善治
  • Organizer: AGU Fall Meeting 2010
  • Place of Presentation: San Francisco, USA
  • Year and Date: 20101213-20101217
• [Presentation] Theory and Observation of Electromagnetic Ion Cyclotron Triggered Emissions in the Magnetosphere (2010)
  • Author(s): Y.Omura, J.Pickett, B.Grison, O.Santolik, I.Dandouras, M.Engebretson, P.M.E.Decreau
  • Organizer: AP-RASC'10
  • Place of Presentation: Toyama, Japan
  • Year and Date: 20100922-20100926
• [Presentation] Plasma Waves and High Energy Particles in the Earth's Radiation Belts (2010)
  • Author(s): 大村善治
  • Organizer: AP-RASC'10
  • Place of Presentation: Toyama, Japan
  • Year and Date: 20100922-20100926
• [Presentation] Theory and Simulations of VLF Triggered Emissions (2010)
  • Author(s): Y.Omura,, M.Hikishima, D.Summers
  • Organizer: 4th VERSIM Workshop
  • Place of Presentation: Prague, Czech
  • Year and Date: 20100913-20100917
• [Presentation] Theory and Simulations of Whistler-Mode Chorus Emissions in the Magnetosphere (Session H) (2010)
  • Author(s): 大村善治
  • Organizer: ISRSSP 2010
  • Place of Presentation: Sofia, Bulgaria
  • Year and Date: 20100825-20100827
• [Presentation] Theory and Simulations of VLF Chorus Emissions (2010)
  • Author(s): 大村善治
  • Organizer: 7th AOGS Meeting
  • Place of Presentation: Hyderabad, India
  • Year and Date: 20100705-20100709
• [Presentation] Theory and Observation of Electromagnetic Ion Cyclotron Triggered Emissions in the Magnetosphere (2010)
  • Author(s): Yoshiharu Omura, Jolene Pickett, Benjamin Grison, et al.
  • Organizer: 7th AOGS Meeting
  • Place of Presentation: Hyderabad, India
  • Year and Date: 20100705-20100709
• [Presentation] Theory and observation of electromagnetic ion cyclotron chorus emissions in the magnetosphere (2010)
  • Author(s): Omura Y., Pickett, J., Grison, B., Santolik, O., Dandouras, I., Engebretson, M., Decreau, P M., Masson, A.
  • Organizer: Western Pacific Geophysics Meeting 2010
  • Place of Presentation: 台北(台湾)
  • Year and Date: 20100622-20100625
• [Presentation] 磁気圏におけるホイッスラーモード波およびEMIC波のコーラス放射の非線形理論 P-EM021(宇宙天気) (2010)
  • Author(s): 大村善治
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ国際会議場
  • Year and Date: 2010-05-25
• [Presentation] ホイッスラーモード・コーラス放射による相対論的電子加速P-EM028 (3学会合同プラズマ宇宙物理-1) (2010)
  • Author(s): 大村善治
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ国際会議場
  • Year and Date: 2010-05-23
• [Presentation] Electromagnetic particle simulations of whistler-mode chorus emissions (2009)
  • Author(s): Y. Omura, M.Hikishima, Y.Katoh
  • Organizer: 2009 Conference on Computational Physics (CCP 2009)
  • Place of Presentation: Kaohsiung, Taiwan
  • Year and Date: 20091215-20091219
• [Presentation] Theory and simulations of nonlinear whistler-mode chorus waves in the radiation belts (2009)
  • Author(s): 大村善治
  • Organizer: WCU International Workshop
  • Place of Presentation: Jeju, Korea
  • Year and Date: 20091026-20091028
• [Presentation] 磁気赤道域における上側周波数帯コーラス放射の発生機構 (2009)
  • Author(s): 大村善治, 疋島充, 加藤雄人, Summers Danny, 八木谷聡
  • Organizer: 第126回地球電磁気・地球惑星圏学会総会・講演会(2009年秋学会)
  • Place of Presentation: 金沢大学
  • Year and Date: 20090927-20090930
• [Presentation] Nonlinear Mechanisms of lower band and upper band VLF (2009)
  • Author(s): Y.Omura, M.Hikishima, Y.Katoh, D.Summers, S.Yagitani
  • Organizer: 11th Scientific Assembly of International Association of Geomagnetism and Aeronomy
  • Place of Presentation: Sopron, Hungary
  • Year and Date: 20090823-20090830
• [Presentation] Nonlinear Mechanisms of Lower Band and Upper Band VLF Chorus Emissions in the Magnetosphere (2009)
  • Author(s): Y.OMURA, M.HIKISHIMA, Y.KATOH, D.SUMMERS, S.YAGITANI
  • Organizer: Asia Oceania Geosciences Society, Asia Oceania Geosciences Society
  • Place of Presentation: Singapore
  • Year and Date: 20090811-20090815
• [Presentation] Theory and simulations of nonlinear whistler-mode chorus waves in the magnetosphere、Modern Challenges in Nonlinear Plasma Physics (2009)
  • Author(s): 大村善治
  • Organizer: A Conference honoring the Career of Dennis Papadopoulos
  • Place of Presentation: Sani Resort, Halkidiki, Macedonia, Greece
  • Year and Date: 20090615-20090619
• [Presentation] Nonlinear particle dynamics associated with electrostatic solitary waves and whistler-mode chorus emissions in the magnetosphere (2009)
  • Author(s): 大村善治
  • Organizer: 17th Cluster Workshop
  • Place of Presentation: Uppsala, Sweden
  • Year and Date: 20090512-20090515
• [Presentation] Nonlinear Wave-Particle Interactions in the Magnetosphere (基調講演) (2009)
  • Author(s): 大村善治
  • Organizer: Asia Oceania Geosciences Society
  • Place of Presentation: Singapore
  • Year and Date: 2009-08-12
• [Presentation] A nonlinear kinetic theory of self-sustaining whistler-mode wave emissions in the inner magnetosphere (2008)
  • Author(s): Y.Omura, M.Hikishima, Y.Katoh, D.Summers, S.Yagitani
  • Organizer: American Geophysical Union (AGU) 2008 Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 20081215-20081221
• [Presentation] 磁気圏におけるホイッスラーモード・コーラス放射の励起機構 (2008)
  • Author(s): 大村善治, 疋島充, 加藤雄人, Summers Danny, 八木谷聡
  • Organizer: 地球電磁気・地球惑星圏学会第124回総会・講演会
  • Place of Presentation: Sendai, Japan
  • Year and Date: 20081009-20081012
• [Presentation] Relativistic electron acceleration by whistler-mode chorus emissions (2008)
  • Author(s): 大村善治
  • Organizer: 3rd VERSIM Workshop 2008
  • Place of Presentation: Tihany, Hungary
  • Year and Date: 20080915-20090920
• [Presentation] Theory and simulation of the generation of whistler-mode chorus emissions (2008)
  • Author(s): 大村善治
  • Organizer: 3rd VERSIM Workshop 2008
  • Place of Presentation: Tihany, Hungary
  • Year and Date: 20080915-20080920
• [Presentation] Relativistic electron acceleration by whistlermode chorus emissions in radiation belts (2008)
  • Author(s): Y.Omura, D.Summers
  • Organizer: Relativistic electron acceleration by whistlermode chorus emissions in radiation belts
  • Place of Presentation: Chicago, USA
  • Year and Date: 20080807-20080816
• [Presentation] Nonlinear wave growth theory of whistler-mode chorus emissions (2008)
  • Author(s): Y.Omura, Y.Katoh, D.Summers
  • Organizer: URSI XXIXth General Assembly
  • Place of Presentation: Chicago, USA
  • Year and Date: 20080807-20080816
• [Presentation] Rapid energization of relativistic electrons by nonlinear wave trapping (2008)
  • Author(s): Y.Katoh, Y.Omura, D.Summers
  • Place of Presentation: Montreal, Canada
  • Year and Date: 20080713-20080720
• [Presentation] Relativistic electron acceleration by whistler-mode chorus emissions associated with substorms (2008)
  • Author(s): 大村善治
  • Place of Presentation: Montreal, Canada
  • Year and Date: 20080713-20080720
• [Presentation] Nonlinear wave growth theory of whistler-mode chorus emissions induced by substorms (2008)
  • Author(s): 大村善治
  • Organizer: 37th Committee on Space Research(COSPAR) Scientific Assembly
  • Place of Presentation: Montreal, Canada
  • Year and Date: 20080713-20080720
• [Presentation] Relativistic Electron Acceleration by Whistler-mode Chorus Emissions Associated with Substorms (2008)
  • Author(s): Y.Omura, D.Summers
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2008
  • Place of Presentation: Busan, Korea
  • Year and Date: 20080616-20080620
• [Presentation] Theory and simulation of the generation of whistler-mode chorus (2008)
  • Author(s): Y.Omura, Y.Kato, D.Summers
  • Organizer: Japan Geoscience Union Meeting 2008
  • Place of Presentation: Makuhari, Japan
  • Year and Date: 20080525-20080530
• [Presentation] Theory and simulation of the generation of whistler mode chorus (2008)
  • Author(s): 大村善治
  • Organizer: The Seventh International Workshop on Nonlinear Waves and Turbulence in Space Plasmas (NLW-7)
  • Place of Presentation: Beaulieu, FRANCE
  • Year and Date: 20080421-20080425
• [Remarks] ホームページ等