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Study of Plasma Turbulence by Means of Bispectrum Anaylyses

Research Project

Project/Area Number 04650366
Research Category

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

Allocation TypeSingle-year Grants
Research Field 計測・制御工学
Research InstitutionThe university of Electro-Communications

Principal Investigator

HAYAKAWA Masashi  The University of Electro-Communications, Department of Electro-Communications, Professor, 電気通信学部, 教授 (80023688)

Co-Investigator(Kenkyū-buntansha) IWAMA Naofumi  Toyama Prefectural University, Faculty of Engineering, Professor, 工学部, 教授 (30023253)
TOMIZAWA Ichiro  The University of Electro-Communications, Dept.of Electro-Communications, Resear, 電気通信学部, 助手 (50111696)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordsプラズマ乱流 / 非線形波動・波動相互作用 / バイコヒーレンス解析 / スペースプラズマ / サイプル電波
Research Abstract

The experimental study on the nonlinear wave-wave interactions in the space plasma was carried out by using both the ISIS-2 satellite observations of Siple Station VLF transmitter signals and the Aureol-3 satellite observations of Alpha VLF signals. We suceeded in analysing extremely a lot of data, and the results can be summarised as follows :
(1)The analysis of Siple signals has indicated that we could detect the sideband structures on the ISIS-2 satellite, as was first observed by Tanaka, Hayakawa et al.(1987). Then the bispectrum analysis indicated that these sidebands are due to the nonlinear coupling between VLF transmitter signal and the pre-existing ELF emission in the ionosphere.
The further analyzes of Aureol-3 satellite data of Alpha VLF transmission, has yielded some more evidence of the detection of sideband structures due to the monlinear interaction. The direction finding measurement has suggested that this interaction takes place between an electromagnetic strong VLF signal and a quasi-electrostatic ELF emission. The sideband wave is also found to be quasi-electrostatic, which can be confirmed by the fact that such sidebands are only detected on electric antennas.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] T.Ohnami,M.Hayakawa,T.F.Bell & T.Ondoh: "Nonlinear wave-wave interactions in the subauroral ionosphere on the basis of ISIS-2 satellite observations of Siple Station VLF signals" Geophysical Research Letters(USA). 20. 739-742 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] V,Yu,Tvakhtengerts & M,Hayakawa: "A wave-wave interaction in whistler frequency range in space plasma" Jour.Geophysical Research(USA). 98. 19205-19217 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T,Ohnami, M.Hayakawa, T.F.Bell & T.Ondoh: "Nonlinear was wave-wave interaction in the subauroral ionosphere on the basis of ISIS-2 setallite observations of Siple Station VLF signals" Geophysical Research Letters. vol.20. 739-742 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] V.Yu.Trakhtengerts and M.Hayakawa: "A wave-wave interaction in whistler frequency range in space plasma" Jour.Geophysical Physics. vol.98. 19205-19217 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] S.Ohnami,M.Hayakawa,T.F.Bell,T.Ordoh: "Nonlinear wave-wave interactions in the Subauroral ionosphere on the basis of ISIS-2 satellite observations of Siple Station VLF signals" Geophysical Research Letters. 20. 739-742 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] V.Yu,TrakhtengerAs Θ M.Hayakawa: "A Wave-wave interaction in whistler frequency range in space plasma" Jour.Geophysical Research. 98. 19205-19217 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Ohnami: "Bispectrum analysis of nonlinear interactions between VLF transmitter signals and ELF emissions" Proc.Int'l Symp.on Antennad Propagation. 197-200 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 早川 正士: "電離層プラズマ中での非線形三波過程のバイスペクトル解析" 第6回ディジタル信号処理シンポジウム. 411-416 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] 大浪 哲: "電離層プラズマ中での非線形波動・波動相互作用の観測と解析" 電子情報通信学会アンテナ・伝搬技術研究会報告. AP92-42. 17-24 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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