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Study on Global Structure of Space Plasma Wave Energy by Using Large Scale Ray-Tracing

Research Project

Project/Area Number 63420016
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field Space and upper atmospheric physics
Research InstitutionKyoto University

Principal Investigator

KIMURA Iwane  Faculty of Eng., Kyoto Univ., Professor, 工学部, 教授 (00025884)

Co-Investigator(Kenkyū-buntansha) MATSUNO Toshio  Faculty of Eng., Kyoto Univ., Teaching Assistant, 工学部, 教務職員 (80109032)
OMURA Yohiharu  RASC, Kyoto Univ., Assistant Professor, 超高層電波研究センター, 助教授 (50177002)
SATO Toru  Faculty of Eng., Kyoto Univ., Lecturer, 工学部, 講師 (60162450)
山本 正幸  京都大学, 工学部, 助手 (30200843)
筒井 稔  京都大学, 超高層電波研究センター, 助手 (10026172)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥27,300,000 (Direct Cost: ¥27,300,000)
Fiscal Year 1990: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1989: ¥10,300,000 (Direct Cost: ¥10,300,000)
Fiscal Year 1988: ¥14,000,000 (Direct Cost: ¥14,000,000)
KeywordsRay tracing / Satellite Akebono / Magnetospheric Plasma / Wave normal vector / Whistler mode / Ion cyclotron mode / Graphic routine / 磁気圏プラズマ / EXOSーD(Akebono)衛星 / オメガ信号 / 伝搬ベクトル計測 / 波動ー粒子相互作用 / トリガ-ド放射 / 磁気圏 / 宇宙空間プラズマ / 科学衛星EXOS-D(あけぼの) / 波動粒子相互作用
Research Abstract

The main objectives of this project were (1) to extend our ray tracing technique for calculating ray paths of VLF and ELF waves in the earth magnetosphere and (2) to apply this technique to the VLF and ELF waves observed by Akebono satellite for interpretation of these wave phenomena. Important results are summarized :
1. The computer programs for ray tracing of VLF whistler mode and ELF ion cyclotron mode, both originally developed for supercomputers, were transplanted to workstations and completed various graphic routines to represent the results of calculation on a display and to get hardcopies on request.
2. Application of the above ray tracing system to the wave data observed by the Akebono Satellite are as follows :
a) By the VLF wave instruments on-board the satellite, Omega signals (10.2KHz) for ground navigation have been observed and spatial distributions of their signal intensity and wave normal direction in the magnetosphere were determined. These results can be compared with those theoretically calculated by ray tracing technique, if an appropriate Plasma model in the magnetosphere is given. We have developed a method to make a plasma density model which best fits the electron density actually observed along the satellite trajectory. It was found the results of ray tracing using the plasma model thusmade satisfactorily agree with those observed by Akebono.
b) By the ELF wave instrument on-board the satellite, new ELF emission phenomena were discovered, which exist only in the magnetic equatorial region in the frequency range below 100Hz. These emissions are closely related with ion cyclotron frequency of Helium and Oxygen ions, so that they are interpreted as ion cyclotron mode emissions generated by an anisotropic temperature of super-thermal protons. In order to confirm this hypothesis, our ray tracing technique has been used and our interpretation was found to be satisfactory.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] I.Kimura,K.Hashimoto,I.Nagano,T.Okada,M.Yamamoto,T.Toshino,H.Matsumoto,M.Ejiri,and K.Hayashi: "VLE observations by Akebono(EXOSーD)satellite" Jonrual of Geomagnetism and Geoelectricity. 42. 495-478 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 山本 正幸、大村 磬根、長野 勇、橋本 弘蔵、岡田 敏美、林 幹治、澤田 晃、伊藤 嘉彦、軒内 栄一: "あけぼの(EXOSーD)搭載VLE装置による初期観測結果" 宇宙科学研究報告. 25. 63-73 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] I.Kimura,A.Wong,B.Chouinard,T.Okada,M.Mccarrick,I.Nagano,K.Hashimoto,R.Wuerker,M.Yamamoto and K.Ishida: "Satellite and ground observations of HIPAS VLE modulation" Geophysical Research Letters. 18. 309-312 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Sawada,Y.Kasahara,M.Yamamoto,I.Kimura,S.Kokubun and K.Hayashi: "ELF emissions observed by the EXOSーD satellite aronud the geomagnetic equatorial region" Geophysical Research Letters. 18. 317-320 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Sawada,Y.Kishi,M.Yamamoto,A.Sakurai,Y.Kasahara,and I.Kimura: "Propagation characteristics of Omega signals and their triggered emissions observed by EXOSーD satellite" Geophysical Research Letters. 18. 321-324 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Yamamoto,Y.Ito,Y.Kishi,A.Sawada,I.Kimura,I.Nagano,E.Kennai,T.Okada and K.Hashimoto: "К vector measurements of VLE signals by the satellite EXOSーD" Gerphysical Research Letters. 18. 325-328 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] I. Kimura: "Ray paths of electromagnetic and electrostatic waves in the earth and planetary magnetospheres" AGU Monograph. 53. 161-171 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] I. Kimura, K. Hashimoto, I. Nagano, T. Okada, M. Yamamoto, T. Yoshimoto, H. Masumoto, M Ejiri, and K. Hayashi: "VLE observations by the Akebono (EXOS-D) satellite" Journal of Geomagnetism and Geoelectricity. 42. 495-478 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] I. Kimura, A. Wong, B. Chouinard, T. Okada, M. Mccarrick, I. Nagano, K. Hashimoto, R. Wuerker, M. Yamamoto and K. Ishida: "Satellite and ground observations of HIPAS VLF modulation" Geophysical Research Letters. 18. 309-312 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Hashimoto, I. Nagano, T. Okada, M. Yamamoto and I. Kimura: "Antenna vector impedance measurement by the EXOS-D (Akebono) very low frequency plasma wave instrument (VLE)" Geophysical Research Letters. 18. 313-316 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Sawada, Y. Kasahara, M. Yamamoto, I. Kimrra, S. Kokubun and K. Hayashi: "ELF emissions observed by the EXOS-D satellite around the geomagnetic equatorial region" Geophysical Research Letters. 18. 317-320 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Sawada, Y. Kishi, M. Yamamoto, A. Sakurai, Y. Kasahara, and I. Kimrra: "Propagation characteristics of Omega signals and their triggered emissions observed by EXOS-D satellite" Geophysical Research Letters. 18. 321-324 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Yamamoto, Y. Ito, Y. Kishi, A. Sawada, I. Kimrra, I. Nagano, E. Kennai, T. Okada and K. Hashimoto: "Kappa vector measurements of VLF signals by the satellite ESOS-D" Geophysical Research Letters. 18. 325-328 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Kasahara, A. Sawada, M. Yamamoto, I. Kirura, S. Kokubun and K. Hayashi: "Ion cyclotron emissions observed by the satellite Akebono in the vicinity of the magnetic equator" Radio Science. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] I.Kimura,K.Hashimoto,I.Nagano,T.Okada,M.Yamamoto,T.Yoshino,H.Matsumoto,M Ejiri,and K.Hayashi: "VLF observations by the Akebono(EXOSーD)satellite" Journal of Geomagnetism and Geoelectricity. 42. 495-478 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 山本 正幸、木村 磐根、長野 勇、橋本 弘蔵、岡田 敏美、林 幹治、澤田 晃、伊藤 嘉彦、軒内 栄一: "あけぼの(EXOSーD)塔載VLF装置による初期観測結果" 宇宙科学研究報告. 25. 63-73 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] I.Kimura,A.Wong,B.Chouinard,T.Okada,M.Mccarrick,I.Nagano,K.Hashimoto,R.Wuerker,M.Yamamoto and K.Ishida: "Satellite and ground observations of HIPAS VLF modulation" Geophysical Research Letters. 18. 309-312 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Sawada,Y.Kasahara,M.Yamamoto,I.Kimura,S.Kokubun and K.Hayashi: "ELF emissions observed by the EXOSーD satellite around the geomagnetic equatorial region" Geophysical Research Letters. 18. 317-320 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Sawada,Y.Kishi,M.Yamamoto,A.Sakurai,Y.Kasahara,and I.Kimura: "Propagation characteristics of Omega signals and their triggered emissions observed by EXOSーD satellite" Geophysical Research Letters. 18. 321-324 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Yamamoto,Y.Ito,Y.Kishi,A.Sawada,I.Kimura,I.Nagano,E.Kennai,T.Okada and K.Hashimoto: "κ vector measurements of VLF signals by the satellite EXOSーD" Geophysical Research Letters. 18. 325-328 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] I.Kimura,K.Hashimoto,I.Nagano,T.Okada,M.Yamamoto,T.Yoshino,H.Matsumoto,M.Ejiri&K.Hayashi: "VLF OBSERVATION BY THE AKEBONO SATELLITE" J.GEOMAGNETITSM&GEOELECTRICITY. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Ito,M.Yamamoto,A.Sawada,I.Kimura,I.Nagano,E.Kennai,T.Okada&K.Hashimoto: "K VECTOR MEASUREMENTS OF VLF SIGNALS BY THE SATELLITE EXOS-D" Geophysical Research Letter(U.S.A). (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 大村善治: Computer Physics Communication. 49. 133-142 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 大村善治: J.Geomag.Geoelectr.40. 946-961 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 大村磐根: "AGU Monograph:Plasma waves and instabilities at comets and magnetospheres "Ray paths of electromagnetic and electrostatic waves in the earth and planetary magnetospheres"" American Geophysical Uinon, (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 大村善治: "AGU Monograph:Particle simulations of nonlinear of whistler and Alfver wave instabilities "Amplitude modulation,decay,soliton and inverse cascading"" American Geophysical Union, (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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