ジャイロ・プラズマプローブによる電離層電子密度の測定  [in Japanese] Measurement of Ionospheric Electron Density by Gyro Plasma Probe  [in Japanese]

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Abstract

ジャイロ周波数およびプラズマ周波数を含む周波数範囲でプラズマインピーダンスを掃引測定する新しいプラズマプローブとしてジャイロプラズマプローブを開発した.理論的に電子ジャイロ共鳴,シース共鳴およびハイブリッド共鳴の存在を予測していたが,まず1965年7月27日1210 JSTに発射されたK-9M-13号ロケットによる実験でシース共鳴とハイブリッド共鳴を含むジャイロプラズマプローブのデータが得られ,理論を一部実証した.特にハイブリッド共鳴周波数から正確な電子密度分布が得られた.続いて1965年10月4日に発射されたK-9M-14号ロケットによる実験では測定周波数を1.15Mcと5.01Mcの二つに固定して,共鳴の基本的な性質を観測した.その結果ジャイロ共鳴の存在を実証するとともに,ハイブリッド共鳴がイオンシースの存在およびプローブの磁場となす姿勢に無関係に定まることがわかり,これを電子密度測定に応用した場合に精度の高い結果が得られることが確認された.資料番号: SA0124914000

The first experiment of a new impedance probe, called the gyroplasma probe, was carried out by using K-9M-13 rocket launched at 1210 JST, on July 27, 1965 from KSC (Kagoshima Space Center), Japan. Two spheres with radius 20mm are sticked out into the ionospheric medium and sustained by the thin and short booms symmetrically for the rocket body. Impedance of this probe system is measured in the frequency range from 0. 5 Me to 16 Me, swept continuously in 0. 93 second. The date was obtained from 80km to 317km, successfully. Theoretical result on the performance of the RF impedance probe in wide frequency range was confirmed by detecting the upper hybrid resonance and so called sheath resonance in each sweep interval. The accurate electron density was deduced from the upper hybrid resonance frequency 〓, where fp is plasma frequency and fa is the electron gyro-frequency. An detailed structure of the ionosphere under the stormy condition which is characterised by the existence of a valley structure between F_1 and F_2 layers was disclosed. The second experiment was performed by using K-9M-14 rocket launched at 1200 JST, on October 4, 1965 from KSC. To ascertain the resonance effects observed in the first experiment, two fixed frequencies, 1.15 Me and 5.01 Me were employed for measurement of the impedance of a short cylindrical-type probe with length 1.20 rn. The detection of three resonances was successful at each height where the employing frequencies correspond to the gyro, sheath and upper-hybrid resonances.

Journal

  • Bulletin of the Institute of Space and Aeronautical Science, University of Tokyo

    Bulletin of the Institute of Space and Aeronautical Science, University of Tokyo 2(3A), 959-972, 1966-07

    Japan Aerospace Exploration Agency

Codes

  • NII Article ID (NAID)
    110000196809
  • NII NACSIS-CAT ID (NCID)
    AN00161914
  • Text Lang
    JPN
  • Article Type
    departmental bulletin paper
  • Journal Type
    大学紀要
  • ISSN
    05638100
  • NDL Article ID
    8329990
  • NDL Source Classification
    ZN25(科学技術--運輸工学--航空機・ロケット)
  • NDL Call No.
    Z16-331
  • Data Source
    NDL  NII-ELS  IR 
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