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Nonlinear full-wave analysis of atmospheric luminous emissions above lightning discharges

Research Project

Project/Area Number 13640447
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, Graduate School of Natural Science and Technology, Professor, 自然科学研究科, 教授 (50019775)

Co-Investigator(Kenkyū-buntansha) YAGITANI Satoshi  Kanazawa University, Graduate School of Natural Science and Technology, Associate Professor, 自然科学研究科, 助教授 (30251937)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsLightning discharge / Electromagnetic pulse / Ionosphere / Optical emission / Elves / Electron heating / Full wave analysis / Parallel computation / 雷放雷 / 雷磁波パルス / 雷離層 / full wave計算法 / 衝突周波数
Research Abstract

We have investigated the generation mechanism of "elves," the expanding optical rings created 85-95 km above lightning flashes. Elves are believed to be generated through the excitation of the first positive band of nitrogen molecule, which is stimulated by the electron heating due to the lightning-generated intense electromagnetic pulses (EMPs) illuminating the lower ionosphere. By using a full-wave analysis, we have computed rigorously the propagation in a magnetized ionosphere of the EMPs radiated by lightning current strokes. When incident into the lower ionosphere, an intense EMP heats the electrons and then enhances the collision frequency there, causing the absorption of the EMP energy. Though the full wave analysis cannot treat such a nonlinear temporal change of ionospheric parameters, we have approximately incorporated this effect into the calculation by modifying the up-going EMP in the ionosphere. Making use of a newly developed parallel-computation system with 10 PCs, we have computed the temporal and spatial evolution of elves. Computed results have shown that an optical ring is created at the altitudes of 85-100 km above the lightning, quickly expanding horizontally over 200 km within < 1 ms, which is consistent with the actual observations of elves. It has also been found that because of the EMP propagation in the whistler mode along the Earth's magnetic field line above 90 km, there appears appreciable north-south and east-west asymmetry in the elves ring structures.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Y.Yoshimura, I.Nagano, S.Yagitani, S.Shinmura: "FDTD analysis of electromagnetic shielding effectiveness of obliquely incident waves"The Transactions of IEE of Japan A. 121-A. 964-965 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 高野博史, 長野勇, 八木谷聡, 福岡将, 松本紘: "地球磁気圏遠尾部におけるLobe Trapped Continuum Radiationの伝搬特性"電子情報通信学会論文誌. J84-B. 2358-2366 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Nagano, S.Yagitani, K.Miyamura, S.Makino: "Full wave analysis of elves created by lightning-generated electromagnetic pulses"Journal of Atmospheric and Solar-Terrestrial Physics. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Nagano, X.-Y.Wu, H.Takano, S.Yagitani, H.Matsumoto, K.Hashimoto, Y.Kasaba: "Remote sensing the magnetosheath by the spin modulation of terrestrial continuum radiation"Journal of Geophysical Research. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 高野博史, 長野勇, 八木谷聡: "レゾナンスの影響を考慮した無衝突磁化プラズマ中における電磁波伝搬の解析"電子情報通信学会論文誌. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Yoshimura, I. Nagano, S. Yagitani, and S. Shinmura: "FDTD analysis of electromagnetic shielding effectiveness of obliquely incident waves"The Transactions of IEE of Japan A. 121-A. 964-965 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Takano, I. Nagano, S, Yagitani, M. Fukuoka, and H. Matsumoto: "Propagation characteristics of lobe trapped continuum radiation in the distant magnetotail (in Japanese)"The Transactions of IEICE B. J84-B. 2358-2366 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I. Nagano, S. Yagitani, K. Miyamura, and S. Makino: "Full wave analysis of elves created by lightning-generated electromagnetic pulses"Journal of Atmospheric and Solar-Terrestrial Physics. in press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I. Nagano, X.-Y. Wu, H. Takano, S. Yagitani, H. Matsumoto, K. Hashimoto, and Y. Kasaba: "Remote sensing the magnetosheath by the spin modulation of terrestrial continuum radiation"Journal of Geophysical Research. in press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Takano, I. Nagano, and S. Yagitani: "Analysis of electromagnetic wave propagation with resonance effect in collision-free magnetized plasma (in Japanese)"The Transactions of IEICE B. in press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Nagano, S.Yagitani, K.Miyamura, S.Makino: "Full wave analysis of elves created by lightning-generated electromagnetic pulses"Journal of Atmospheric and Solar-Terrestrial Physics. (印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] I.Nagano, X-Y.Wu, H.Takano, S.Yagitani, H.Matsumoto, K.Hashimoto, Y.Kasaba: "Remote sensing the magnetosheath by the spin modulation of terrestrial continuum radiation"Journal of Geophysical Research. (印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 高野博史, 長野勇, 八木谷聡: "レゾナンスの影響を考慮した無衝突磁化プラズマ中における電磁波伝搬の解析"電子情報通信学会論文誌. (印刷中). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Yoshimura, I. Nagano, S.Yagitani, S. Shinmura: "FDTD analysis of electromagnetic shielding effectiveness of obliquely incident waves"Transactions of IEE of Japan. 120-A・10. 964-965 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 高野 博史, 長野 勇, 八木谷 聡, 福岡 将, 松本 絋: "地球磁気圏遠尾部におけるLobe Trapped Continuum Radiationの伝搬特性"電子情報通信学会論文誌. J84-B・12. 2358-2366 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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