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2000 Fiscal Year Final Research Report Summary

STUDY ON FORMATION PROCESSES OF ELECTROSTATIC SOLITARY WAVES IN SPACE PLASMAS

Research Project

Project/Area Number 10440136
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

OMURA Yoshiharu  Kyoto University, Radio Science Center for Space and Atmosphere, Professor, 宙空電波科学研究センター, 教授 (50177002)

Co-Investigator(Kenkyū-buntansha) MUKAI Toshifumi  the Institute of Space and Astronautical Science, Professor, 宇宙科学研究所, 教授 (60013695)
KOJIMA Hirotsugu  Kyoto University, Radio Science Center for Space and Atmosphere, Associate Professor, 宙空電波科学研究センター, 助教授 (10215254)
USUI Hideyuki  Kyoto University, Radio Science Center for Space and Atmosphere, Associate Professor, 宙空電波科学研究センター, 助教授 (10243081)
MATSUMOTO Hiroshi  Kyoto University, Radio Science Center for Space and Atmosphere, Professor, 宙空電波科学研究センター, 教授 (00026139)
Project Period (FY) 1998 – 2000
Keywordselectrostatic solitary waves / electron beam / open system / space plasma / particle code / magnetosphere / computer simulation / GEOTAIL
Research Abstract

Analyzing the data by the Geotail spacecraft, we found that electrostatic solitary waves (ESW) are carried by high energy electron fluxes along the ambient magnetic field, which agree with the ESW formation model postulated from the simulations. Through statistical analysis of ESW waveforms on many orbits of the Geotail spacecraft in the magnetotail, we found that the generation regions of ESW are located near the neutral points. We performed a 2D particle simulation of magnetic reconnection, and we found that there exist acceleration processes of electrons near the reconnection points. We performed 2D simulations of the bump-on-tail instability to find that 1D solitary potentials are formed after nonlinear evolution of the instability. In the two-stream instability of electrons in a 2D.periodic system, on the other hand, we found that large amplitude potentials traveling fast along the magnetic field can exist stably through coupling with lower hybrid waves propagating slowly in the oblique direction. We also performed 2D simulations with open boundaries, injecting electron beam from one of the boundaries. We found that the ESW formation process found in the periodic system can also take place at the top portion of the electron beam traveling stably through the unperturbed warm plasma. Through theoretical analysis of the ESW formation process based on the BGK theory, we clarified that coalescence of two ESW is an irreversible process where the kinetic energy of electron holes is converted to the thermal energy of electrons trapped in the potential.

  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Miyake,T.: "Two-Dimensional Computer Simulations of Electrostatic Solitary Waves Observed by GEOTAIL Spacecraft"Jounal of Geophysical Research. 103. 11841-118501 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Matsumoto,H.: "Generation Mechanism of ESW based on GEOTAIL Plasma Wave Observation, Plasma Observation and Particle Simulation"Geophysical Research Letters. 26. 421-424 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Omura,Y.: "Electrostatic solitary waves carried by diffused electron beams observed by the GEOTAIL spacecraft"Jounal of Geophysical Research. 104. 14627-14637 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojima,H.: "Electrostatic solitary waves observed in the geomagnetic tail and other regions"Advances in Space Research. 23. 1689-1697 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojima,H.: "Plasma waves in the slow mode shocks observed by Geotail spacecraft"Advances in Space Research. 24. 51-54 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Omura,Y.: "Two-dimensional electrostatic solitary waves observed by geotail in the magnetotail"Advances in Space Research. 24. 55-58 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojima,H.: "Characteristics of electrostatic solitary waves observed in the plasma sheet boundary : Statistical analyses"Nonlinear Processes in Geophysics. 6. 179-186 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Krasovsky,,V.L.: "Interaction Dynamics of Electrostatic Solitary Waves"Nonlinear Processes in Geophysics. 6. 205-209 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Krasovsky,V.L.: "Interaction of small phase density holes"Physica Scripta. 60. 438-451 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojima,H.: "Automatic waveform selection method for electrostatic solitary waves"Earth Planets and Space. 52. 495-502 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyake,T.: "Electrostatic particle simulations of solitary waves in the auroral region"Journal of Geophysical Research. 105. 23239-23249 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Omura,Y.: "Observational evidence of dissipative small scale processes : Geotail spacecraft observation and simulation of electrostatic solitary waves"Astrophysical Space Science Journal. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyake, T.: "Two-Dimensional Computer Simulations of Electrostatic Solitary Waves Observed by GEOTAIL Spacecraft"Journal of Geophysical Research. 103. 11841-11850 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsumoto, H.: "Generation Mechanism of ESW based on GEOTAIL Plasma Wave Observation, Plasma Observation and Particle Simulation"Geophysical Research Letters. 26. 421-424 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Omura, Y.: "Electrostatic solitary waves carried by diffused electron beams observed by the GEOTAIL spacecraft"Journal of Geophysical Research. 104. 14627-14637 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojima, H.: "Electrostatic solitary waves observed in the geomagnetic tail and other regions"Advances in Space Research. 23. 1689-1697 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojima, H.: "Plasma waves in the slow mode shocks observed by Geotail spacecraft"Advances in Space Research. 24. 51-54 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Omura, Y.: "Two-dimensional electrostatic solitary waves observed by geotail in the magnetotail"Advances in Space Research. 24. 55-58 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojima, H.: "Characteristics of electrostatic solitary waves observed in the plasma sheet boundary : Statistical analyses"Nonlinear Processes in Geophysics. 6. 179-186 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Krasovsky, , V.L.: "Interaction Dynamics of Electrostatic Solitary Waves"Nonlinear Processes in Geophysics. 6. 205-209 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Krasovsky, V.L.: "Interaction of small phase density holes"Physica Scripta. 60. 438-451 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojima, H.: "Automatic waveform selection method for electrostatic solitary waves"Earth Planets and Space. 52. 495-502 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyake, T.: "Electrostatic particle simulations of solitary waves in the auroral region"Journal of Geophysical Research. 105. 23239-23249 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Omura, Y.: "Observational evidence of dissipative small scale processes : Geotail spacecraft observation and simulation of electrostatic solitary waves"Astrophysical Space Science Journal. in press. (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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