Study of Triggered Emissions and Associated High Energy Transfport in Geospace

2013 Fiscal Year Final Research Report

• Project/Area Number: 23340147
• 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 京都大学, 生存圏研究所, 教授 (50177002)
• Co-Investigator(Kenkyū-buntansha): YAGITANI Satoshi 金沢大学, 理工研究領域, 教授 (30251937)
• Co-Investigator(Renkei-kenkyūsha): KATOH Yuto 東北大学, 理学研究科, 教授 (60378982)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Keywords: プラズマ波動 / 計算機シミュレーション / 放射線帯 / 相対論的電子 / 非線形波動 / 非線形ダイナミックス / 不安定性 / 内部磁気圏

Research Abstract

Computer simulations have successfully been conducted, reproducing whistler-modo chorus emissions and electromagnetic ion cyclotron (EMIC) triggered emissions with physical models based on spacecraft observations. The nonlinear wave growth theory for rising-tone emissions has been developed, clarifying the generation mechanism of these emissions. Significant progress has been made in our understanding of the saturation mechanism of the nonlinear wave growth and resulting formation of chorus elements comprising sub-packets structures.

Research Products

• [Journal Article] Nonlinear damping of chorus emissions at local half cyclotron frequencies observed by Geotail at L > 9 (2014)
  • Author(s): T. Habagishi, S. Yagitani, and Y. Omura
  • Journal Title: J. Geophys. Res.
  • DOI: 10.1002/2013JA019696
• [Journal Article] Geotail observation of upper-band and lower-band chorus elements in the outer magnetosphere (2014)
  • Author(s): S. Yagitani, T. Habagishi, and Y. Omura
  • Journal Title: J. Geophys. Res.
  • DOI: 10.1002/2013JA019678
• [Journal Article] Spectrum characteristics of electromagnetic ion cyclotron triggered emissions and associated energetic proton dynamics (2014)
  • Author(s): M. Shoji and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 119
  • DOI: 10.1002/2013JA019695
• [Journal Article] Direct Measurement of Nonlinear Wave-Particle Interactions in the Earth's Magnetosphere, Wave-Particle Interaction Analyzer (WPIA) for ERG Mission (2014)
  • Author(s): Y. Katoh, M. Hikishima, H. Kojima, Y. Omura, S. Kasahara, M. Hirahara, Y. Miyoshi, K. Seki, K. Asamura, T. Takeshima, T. Ono
  • Journal Title: JPS Conf. Proc. Volume: 015100
• [Journal Article] Electromagnetic ion cyclotron rising tone emissions observed by THEMIS probes outside the plasmapause (2014)
  • Author(s): S. Nakamura, Y. Omura, S. Machida, M. Shoji, M, Nose, V. Angelopoulos
  • Journal Title: J. Geophys. Res. Volume: 119
  • DOI: 10.1002/2013JA019146
• [Journal Article] Akebono observations of EMIC waves in the slot region of the radiation belts (2013)
  • Author(s): K. Sakaguchi, Y. Kasahara, M. Shoji, Y. Omura, Y. Miyoshi, T. Nagatsuma, A. Kumamoto and A. Matsuoka
  • Journal Title: Geophys. Res. Lett. Volume: 40
  • DOI: 10.1002/2013GL058258
• [Journal Article] Electron acceleration by Z-mode and whistler-mode waves (2013)
  • Author(s): K. H. Lee, Y. Omura, and L. C. Lee
  • Journal Title: Phys. Plasmas Volume: 20 Pages: 112901
  • DOI: 10.1063/1.4829439
• [Journal Article] Triggering process of electromagnetic ion cyclotron rising tone emissions in the inner magnetosphere (2013)
  • Author(s): M. Shoji and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 118 Pages: 5553-5561
  • DOI: 10.1002/jgra.50523
• [Journal Article] Relativistic electron microbursts due to nonlinear pitch-angle scattering by EMIC triggered emissions (2013)
  • Author(s): Y. Omura and Q. Zhao
  • Journal Title: J. Geophys. Res.
  • DOI: 10.1002/jgra.50477
• [Journal Article] Parameter spaces for linear and nonlinear whistler-mode waves (2013)
  • Author(s): D. Summers, R. Tang, Y. Omura, and D. H. Lee
  • Journal Title: Phys. Plasmas Volume: 20 Pages: 072110
  • DOI: 10.1063/1.4816022
• [Journal Article] Effect of the background magnetic field inhomogeneity on generation processes of whistler-mode chorus and broadband hiss-like emissions (2013)
  • Author(s): Y. Katoh and Y. Omura
  • Journal Title: J. Geophys. Res.
  • DOI: 10.1002/jgra.50395
• [Journal Article] Ray tracing of whistler-mode chorus elements : implications for generation mechanisms of rising and falling tone emissions (2013)
  • Author(s): K. Yamaguchi, T. Matsumuro, Y. Omura, and D. Nunn
  • Journal Title: Ann. Geophys. Volume: 31 Pages: 665-673
• [Journal Article] Significance of Wave-Particle Interaction Analyzer for direct measurements of nonlinear wave-particle interactions (2013)
  • Author(s): Y. Katoh, M. Kitahara, H. Kojima, Y. Omura, S. Kasahara, M. Hirahara, Y. Miyoshi, K. Seki, K. Asamura, T. Takashima, and T. Ono
  • Journal Title: Ann. Geophys. Volume: 31 Pages: 503-512
• [Journal Article] EMIC triggered chorus emissions in Cluster data (2013)
  • Author(s): Grison, B., O. Santolik, N. Cornilleau-Wehrlin, A. Masson, M. J. Engebretson, J. S. Pickett, Y. Omura, P. Robert, R. Nomura
  • Journal Title: J. Geophys. Res. Volume: 118
  • DOI: 10.1002/jgra.50178
• [Journal Article] The Energization and Radiation in Geospace (ERG) Project, AGU Monograph "Dynamics of the Earth's Radiation Belts and Inner Magnetosphere" (2012)
  • Author(s): Y. Miyoshi, T. Ono, T. Takashima, K. Asamura, M. Hirahara, Y. Kasaba, A. Matsuoka, H. Kojima, K. Shiokawa, K. Seki, M. Fujimoto, T. Nagatsuma, C.Z. Cheng, Y. Kazama, S. Kasahara, T. Mitani, H. Matsumoto, N. Higashio, A. Kumamoto, Yagitani, Y. Kasahara, K. Ishisaka, L. Blomberg, A. Fujimoto, Y. Katoh, Y. Ebihara, Y. Omura, M. Nosé, T. Hori, Y. Miyashita, Y.-M. Tanaka and T. T. Segawa
  • Journal Title: The Energization and Radiation in Geospace (ERG) Project
  • DOI: 10.1029/2012GM001304
• [Journal Article] Linear and Nonlinear Growth of Magnetospheric Whistler Mode Waves (2012)
  • Author(s): D. Summers, R. Tang, and Y. Omura
  • Journal Title: AGU Monograph "Dynamics of the Earth's Radiation Belts and Inner Magnetosphere"
  • DOI: 10.1029/2012GM001298
• [Journal Article] Generation processes of whistler-mode chorus emissions : Current status of nonlinear wave growth theory (2012)
  • Author(s): Omura Y., D. Nunn, and D. Summers
  • Journal Title: AGU Monograph "Dynamics of the Earth's Radiation Belts and Inner Magnetosphere"
  • DOI: 10.1029/2012GM001347
• [Journal Article] THEMIS observation of chorus elements without a gap at half the gyrofrequency (2012)
  • Author(s): S. Kurita, Y. Katoh, Y. Omura, V. Angelopoulos, C. M. Cully, O. Le Contel,and H. Misawa
  • Journal Title: J. Geophys. Res. Volume: VOL.117 Pages: A11223
  • DOI: 10.1029/2012JA018076
• [Journal Article] Precipitation of highly energetic protons by helium branch electromagnetic ion cyclotron triggered emissions (2012)
  • Author(s): Shoji, M., and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: VOL.117 Pages: A12210
  • DOI: 10.1029/2012JA017933
• [Journal Article] Nonlinear spatio-temporal evolution of whistler mode chorus waves in Earth's inner magnetosphere (2012)
  • Author(s): Summers, D., Y. Omura, Y. Miyashita, and D.-H. Lee
  • Journal Title: J. Geophys. Res. Volume: 117 Pages: A09206
  • DOI: 10.1029/2012JA017842
• [Journal Article] A computational and theoretical analysis of falling frequency VLF emissions (2012)
  • Author(s): Nunn, D., and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 117 Pages: A08228
  • DOI: 10.1029/2012JA017557
• [Journal Article] Nonlinear pitch-angle scattering of relativistic electrons by EMIC waves in the inner magnetosphere (2012)
  • Author(s): Omura Y., and Q. Zhao
  • Journal Title: J. Geophys. Res. Volume: 117 Pages: A08227
  • DOI: 10.1029/2012JA017943
• [Journal Article] Multidimensional nonlinear mirror-mode structures in the Earth's magnetosheath (2012)
  • Author(s): Shoji, M., Y. Omura, and L.-C. Lee
  • Journal Title: J. Geophys. Res. Volume: 117
  • DOI: 10.1029/2011JA017420
• [Journal Article] Particle simulations of whistler-mode rising-tone emissions triggered by waves with different amplitudes (2012)
  • Author(s): Hikishima, M., and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 117 Pages: A04226
  • DOI: 10.1029/2011JA017428
• [Journal Article] Effects of nonlinear wave growth on extreme radiation belt electron fluxes (2011)
  • Author(s): Summers, D., R. Tang, and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 116 Pages: A10226
  • DOI: 10.1029/2011JA016602
• [Journal Article] Electromagnetic ion cyclotron waves in the helium branch induced by multiple electromagnetic ion cyclotron triggered emissions (2011)
  • Author(s): Shoji, M., Y. Omura, B. Grison, J. Pickett, I. Dandouras, and M. Engebretson
  • Journal Title: Geophys. Res. Lett. Volume: 38 Pages: L17102
  • DOI: 10.1029/2011GL048427
• [Journal Article] Amplitude dependence of frequency sweep rates of whistler mode chorus emissions (2011)
  • Author(s): Katoh, Y., and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 116 Pages: A07201
  • DOI: 10.1029/2011JA016496
• [Journal Article] Simulation of electromagnetic ion cyclotron triggered emissions in the Earth's inner magnetosphere (2011)
  • Author(s): Shoji, M., and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 116 Pages: A05212
  • DOI: 10.1029/2010JA016351
• [Journal Article] Triggering process of whistler mode chorus emissions in the magnetosphere (2011)
  • Author(s): Omura, Y., and D. Nunn
  • Journal Title: J. Geophys. Res. Volume: 116 Pages: A05205
  • DOI: 10.1029/2010JA016280
• [Presentation] Generatin mechanism of whistler-mode chorus emissions (2014)
  • Author(s): Y. Omura
  • Organizer: VERSIM 2014
  • Place of Presentation: Dunedin, New Zealand
  • Year and Date: 2014-01-20
  • Invited
• [Presentation] Generation of EMIC triggered emissions and associated precipitations of energetic protons and relativistic electrons in the Earth's inner magnetosphere (2013)
  • Author(s): Y. Omura
  • Organizer: Naval Research Laboratory, Plasma Physics Devision Colloquium
  • Place of Presentation: Washington DC, USA
  • Year and Date: 2013-12-17
  • Invited
• [Presentation] Nonlinear processes of whistler-mode wave-particle interactions (2012)
  • Author(s): Y. Omura
  • Organizer: BSP SWG Meeting
  • Place of Presentation: APL, U.S.A
  • Year and Date: 20120516-17
  • Invited
• [Presentation] Generation mechanism of whistler-mode chorus emissions (2012)
  • Author(s): Y. Omura
  • Organizer: 39th COSPAR
  • Place of Presentation: Mysore, India
  • Year and Date: 2012-07-19
  • Invited
• [Presentation] NONLINEAR MIRROR MODE STRUCTURES IN MULTIDIMENSIONAL MODELS (2011)
  • Author(s): M. Shoji, Y. Omura, L.-C. Lee
  • Organizer: URSI XXX General Assembly Istanbul
  • Place of Presentation: Turky
  • Year and Date: 20110811-15
  • Invited
• [Presentation] Particle Simulations of Whistler-mode Chorus and Electromagnetic Ion Cyclotron Waves (2011)
  • Author(s): Y. Omura
  • Organizer: 10th International School for Space Simulations (ISSS-10)
  • Place of Presentation: Banff, Canada
  • Year and Date: 20110725-30
  • Invited
• [Presentation] Formation process of relativistic electron flux through interaction with chorus emissions in the Earth's inner magnetosphere (2011)
  • Author(s): Y. Omura
  • Organizer: AGU Chapman Conference on Dynamics of the Earth's Radiation Belts and Inner Magnetosphere
  • Place of Presentation: St. John's, Newfoundland and Labrador, Canada
  • Year and Date: 20110717-22
  • Invited
• [Book] Generation processes of whistler-mode chorus emissions: Current status of nonlinear wave growth theory, AGU Monograph "Dynamics of the Earth's Radiation Belts and Inner Magnetosphere" (2012)
  • Author(s): Omura Y., D. Nunn, and D. Summers
• [Book] Linear and Nonlinear Growth of Magnetospheric Whistler Mode Waves, AGU Monograph "Dynamics of the Earth's Radiation Belts and Inner Magnetosphere" (2012)
  • Author(s): D. Summers, R. Tang, and Y. Omura
• [Book] The Energization and Radiation in Geospace (ERG) Project, AGU Monograph "Dynamics of the Earth's Radiation Belts and Inner Magnetosphere", The Energization and Radiation in Geospace (ERG) Project (2012)
  • Author(s): Y. Miyoshi, T. Ono, T. Takashima, K. Asamura, M. Hirahara, Y. Kasaba, A. Matsuoka, H. Kojima, K. Shiokawa, K. Seki, M. Fujimoto, T. Nagatsuma, C.Z. Cheng, Y. Kazama, S. Kasahara, T. Mitani, H. Matsumoto, N. Higashio, A. Kumamoto, S. Yagitani, Y. Kasahara, K. Ishisaka, L. Blomberg, A. Fujimoto, Y. Katoh, Y. Ebihara, Y. Omura, M. Nosé, T. Hori, Y. Miyashita, Y.-M. Tanaka and T. T. Segawa