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1990 Fiscal Year Final Research Report Summary

Theoretical Estimation and Observation of the Wave Field Intensity on the Ground Radiated by an Electron Beam Antenna in the Ionosphere

Research Project

Project/Area Number 01540349
Research Category

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

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

Principal Investigator

NAGANO Isamu  Professor Faculty of Technology Kanazawa University, 工学部, 教授 (50019775)

Co-Investigator(Kenkyū-buntansha) MIZUNO Eiiti  Assistant Faculty of Technology Kanazawa University, 工学部, 助手 (20229701)
ポール A・ローゼン  金沢大学, 自然科学研究科, 助手
MAMBO Masatoshi  Professor Faculty of Technology Kanazawa University, 工学部, 教授 (90019696)
ROSEN PAUL ALAN  Associate Researcher Natural Science and Technology Kanazawa University
Project Period (FY) 1989 – 1990
KeywordsFull wave / Electron beam / antenna / VLF wave / propagation / noise intensity
Research Abstract

It has been reported recently that an electron beam modulated at VLF frequencies operates with high efficiency as a VLF transmitter in the ionosphere. The Institute of Space and Astronautical Science (ISAS) of Japan is planning a project known as Space Experiments with Particle Accelerations (SEPAC) on the US Space Shuttle in the near future. As one of many scientific experiments in SEPAC, VLF wave observations will be carried out on the ground to determine the efficiency of the electron beam antenna. The electron beam is emitted along Earth's magnetic field lines from space shuttle.
This research project was to support the modulated electron beam experiments from the theoretical and observational View points listed below :
(1) Calculation of the wave intensity on the ground using a horizontally stratified model of the ionosphere and assuming the electron beam is effectively a dipole transmitter of VLF waves.
(2) Observation on the ground of the noise level at frequencies up to 10 kHz to determine the detection threshold of VLF waves emitted from the electron beam.
The results are : The electromagnetic wave field intensities on the ground are estimated theoretically to be 3uV/m to 10 uV/m in a circular region with a radius of 200 km, under the assumptions that the beam current is 10 mA, the beam length is 100 km and the beam is modulated at a frequency of 5 kHz. On the other hand, the noise level at the frequency of 5 kHz was observed using a small loop antenna located on the ground. The intensity of the noise was in the range of 0.1uV/m to 3 uV/m. Therefore, it seems plausible that VLF waves can be detected during a SEPAC-like experiment.
Ten papers related to this research project will be published in term of the project.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Satoshi Yagitani: "Full wave analysis of whistler mode waves exited by circularly polarized spherical waves incident from below" Proceedings of ISAP '89. 2D3ー4. 489-492 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 長野 勇: "電波吸収法による電子温度と中性大気温比及びD層電子密度の測定" 宇宙科学研究所報告. 26. 49-62 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshimi Okada: "Rocket experiment of VLF and MF radio wave measurement by using a signal loop antenna," Trans.of IEICE. E.73. 237-244 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Iwane Kimura: "VLF observations by the Akebono(EXOSーD) satellite" J.Geomag.Geoelectr.42. 459-478 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 長野 勇: "ダイボ-ル波源による電離層上部のVLF電磁界マッピング" 電子情報通信学会誌. J74ーBー11. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 長野 勇: "電離層中のダイボ-ルアンテナによる大地上のVLF波強度の計算" 電気学会電磁界理論研究会. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Yagitani, I. Nagano, I. Kimura and M. Mambo: "Full wave analysis of whistler mode waves exited by circularly polarized spherical waves incident from below" Proceedings of ISAP '89. 2D3-4. 489-492 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I. Nagano, T. Okada, Y. Inoue, M. Mkino and M. Mambo: "Measurements of the ratio Te/Tn and the D layer electron density deduced from the radio absorption method(in Japanese)" ISAS report. 26. 49-62 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Yamamoto, I. Kimura, I. Nagano, K. Hashimoto, T. Okadak. Hyashi and A. Sawada: "Results of preliminary observations by Akebono (EXOS-D) VLF instrument (in Japanese)" ISAS report. 26. 63-73 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Okada and I. Nagano: "Rocket experiment of VLF and MF radio wave measurement by using a signal loop antenna" Trans. of IEICE. E. 73, 2. 237-244 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I. Kimura, K. Hashimoto, I. Nagano, T. Okada, M. Yamamoto, T. Yoshino, H. Matsumoto and K. Hayashi: "VLF observations by the Akebono (EXOS-D) satellite" J. Geomag. Geoelectr.42. 459-478 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I. Kimura, A. Wong, B. Chouinard, T. Okada, M. Mccrrick, I. Nagano, K. Hashimoto, R, Wuerker, M. Yamamoto and K. Ishida: "Satellite and ground observations of HIPAS VLF modulation" Geophys. Res. Lettrs.18, 2. 309-312 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Hashemito, I. Nagano, T. OKada, M. Yamamoto and I. Kimura: "Antenna vector impedance measurement by the EXOS-D (AKEBOMO) very low frequency plasma wave instrument (VLF)" Geophys. Res. Lettrs.18, 2. 313-316 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Yamamoto, Y. Ito, Y. Kishi, A. Sawada, I. Kimura, I. Nagano, E. Kennai, T. Okada and K. Hashimoto: "k Vector measurements of VLF signals by the satellite EXOS-D" Geophys. Res. Lettrs.18, 2. 325-328 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I. Nagano, Y. Kitagishi, S. Yagitani, M. Mambo and I. Kimura: "Mpping of VLF intensities in the ionosphere by a dipole antenna on the ground (in Japnese)" Trans. of IEICE. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I. Nagano, I. Kmura, T. Okada, M. Yamamoto, K. Hashimoto, K. Turuda, M. Kawaguto and A. Sugimori: "Electromagnetic interference (EMI) measurements for the EXOS-D satellite (in Jananese)," ISAS report. (1991)

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

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Published: 1993-08-12  

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