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Study of Generation Mechanism of Lunimous Emissions in the Upper Atmosphere Produced by Lightning Discharge

Research Project

Project/Area Number 09640530
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionKanazawa University

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) YAGITANI Satoshi  Kanazawa University, Faculty of Engineering, Lecturer, 工学部, 講師 (30251937)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsAtmospherics Luminous Emission / EM Radiation from Lighting Discharge / Sprites / Elves / Full Wave Analysis
Research Abstract

We have developed a full-wave method to calculate three-dimensional ionospheric propagation of an electromagnetic pulse radiated from a lightning discharge, to analyze generation mechanisms of luminous emissions in the upper atmosphere above thunderclouds. The main results are summarized as follows :
(a)Both spatial distribution and temporal evolution of an electromagnetic pulse radiated from a lightning discharge have been calculated by a full-wave method which makes use of Fourier transformations in space and time domain.
(b)Assuming luminous emissions above thunderclouds are generated by nitrogen molecules excited by the intense electromagnetic wave radiated by the lightning discharge, we have computed time evolution of the emissions. Computed results suggest that the Elves are generated in the altitude range of 80-100 km by the radiated electromagnetic wave during 0.4-0.7 msec after the lightning stroke, while the Sprites are likely to be generated at lower altitudes (60-70 kin) after 0.6 msec by an intense electrostatic field created by the discharge. These features are consistent with the actual observations of these luminous emissions.
(c)Peculiar frequency-time structures have been found to appear on the electromagnetic pulse when it propagates up in the ionosphere, possibly caused by the multiple reflection of the pulse in the Earth-ionospheric waveguide. Compared with the electromagnetic wave form observations by a rocket experiment conducted above thunderclouds over Wallops Islands, USA, calculated results of the electromagnetic wave forms are quantitatively consistent with the actual observations.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 宮村和俊、長野勇、八木谷聡: "雷放電から放射されるVLF電磁界波形の Full wave 計算" 電子情報通信学会論文誌. J80-B-II. 387-396 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 宮村和俊、長野勇、八木谷聡、木村磐根: "あけぼの衛星の低高度観測におけるオメガ電波強分布の Full wave 計算による解析" 電子情報通信学会論文誌. F80-B-II. 595-603 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I.Nagano,X.-Y.Wu,S.Yagitani,K.Miyamura,H.Matsumoto: "Unusual whistler with very large dispersion near the magnetopause: Geotail ob-servation and ray-tracing modeling" Journal of Geophysical Research. 103. 11827-11840 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Matsumoto,H.Kojima,Y.Omura,I.Nagano: "Plasma waves In geospace: GEOTAIL observations" AGU Monograph. 105. 261-322 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] D.Snklyar,I.Nagano: "On the VLF wave scattering in plasma with density irregularities" Journal of Geophysical Research. 103. 29515-29526 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Yagitani,I.Nagano,H.Matsumoto,Y.Omura,他3名: "Wave and particle measurements for chorus emissions by GEOTAIL in the mag-netosphere" Advances in Space Research. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 長野 勇、他13名: "電波伝搬ハンドブック" リアライズ社, 407 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Miyamura, I.Nagano, and S.Yagitani: "Full wave calculation of VLF waveforms induced by lightning discharge (in Japanese)" Trans.of IEICE. J80-B-II-5. 387-396 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Miyamura, I.Nagano, S.Yagitani, and I.Kimura: "Full wave analysis of Omega signal intensities observed on Akebono satel-like at low altitudes (in Japanese)" Trans.of IEICE. J80-B-II-7. 595-603 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I.Nagano, X.-Y.Wu, S.Yagitani, K.Miyamura, and H.Mat-sumoto: "Unusual whistler with very large dispersion near the magnetopause : Geotail observation and ray-tracing modeling" Journal of Geophysical Research. 103-A6. 11827-11840 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Matsumoto, H.Kojima, Y.Omura, and I.Nagano: "Plasma waves in geospace : GEOTAIL observations" AGU Monograph. 105. 261-322 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] D.Shklyar, and I.Nagano: "On the VLF wave scattering in plasma with density irregularities" Journal of Geophysical Research. 103-A12. 29515-29526 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Yagitani, I.Nagano, H.Matsumoto, Y.Omura, W.R.Pa-terson, L.A.Frank, and R.R.aAnderson.: "Wave and particle measurements for chorus emissions by GEOTAIL in the mag-netosphere" Advances in Space Research. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I.Nagano et al.: Radiowave Propagation Handbook. Realize Inc.(in Japanese), (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 宮村和俊、長野勇、八木谷聡: "雷放電から放射されるVLF電磁界波形のFull wave計算" 電子情報通信学会論文誌. J80-B-II・5. 387-396 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 宮村和俊、長野勇、八木谷聡: "あけぼの衛星の低高度観測におけるオメガ電波強度分布のFull wave計算による解析" 電子情報通信学会論文誌. J80-B-II・7. 595-603 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] I.Nagano,X.-Y.Wu,S.Yag-itani,K.Miyamura,H.Mat-sumoto: "Unusual whistler with very large dispersion near the magnetopause: Geotail observa-tion and ray-tracing modeling" Journal of Geophysical Research. 103・A6. 11827-11840 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Matsumoto,H.Kojima,Y.Omura,I.Nagano: "Plasma waves in geospace: GEOTAIL observations" AGU Monograph. 105. 261-322 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] D.Shklyar,I.Nagano: "On the VLF wave scattering in plasma with density irregularities" Journal of Geophysical Research. 103・A12. 29515-29526 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Yagitani,I.Nagano,H.Matsumoto,Y.Omura,他3名: "Wave and particle measurements for chorus emissions by GEOTAIL in the magneto-sphere" Advances in Space Research. 印刷中. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 長野 勇、他13名: "電波伝搬ハンドブック" リアライズ社, 407 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 宮村,長野,八木谷: "雷放電から放射されるVLF電磁界波形のfull wave計算" 電子情報通信学会論文誌. J80-13-II. 387-396 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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