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Title: Termination of Electron Acceleration in Thundercloud by Intra/Inter-cloud Discharge
Authors: Wada, Yuuki
Bowers, Gregory S.
Enoto, Teruaki  kyouindb  KAKEN_id
Kamogawa, Masashi
Nakamura, Yoshitaka
Morimoto, Takeshi
Smith, David M.
Furuta, Yoshihiro
Nakazawa, Kazuhiro
Yuasa, Takayuki
Matsuki, Atsushi
Kubo, Mamoru
Tamagawa, Toru
Makishima, Kazuo
Tsuchiya, Harufumi
Author's alias: 和田, 有希
榎戸, 輝揚
鴨川, 仁
中村, 佳敬
森本, 健志
古田, 禄大
中澤, 知洋
湯浅, 孝行
松木, 篤
久保, 守
玉川, 徹
牧島, 一夫
土屋, 晴文
Keywords: gamma‐ray glow
winter thunderstorms
atmospheric electric field
low frequency
electron acceleration
Issue Date: 16-Jun-2018
Publisher: American Geophysical Union (AGU)
Journal title: Geophysical Research Letters
Volume: 45
Issue: 11
Start page: 5700
End page: 5707
Abstract: An on‐ground observation program for high energy atmospheric phenomena in winter thunderstorms along Japan Sea has been performed via measurements of gamma‐ray radiation, atmospheric electric field and low‐frequency radio band. On February 11, 2017, the radiation detectors recorded gamma‐ray emission lasting for 75 sec. The gamma‐ray spectrum extended up to 20 MeV and was reproduced by a cutoff power‐law model with a photon index of urn:x-wiley:grl:media:grl57457:grl57457-math-0001, being consistent with a Bremsstrahlung radiation from a thundercloud (as known as a gamma‐ray glow and a thunderstorm ground enhancement). Then the gamma‐ray glow was abruptly terminated with a nearby lightning discharge. The low‐frequency radio monitors, installed ∼50 km away from the gamma‐ray observation site recorded leader development of an intra/inter‐cloud discharge spreading over ∼60 km area with a ∼300 ms duration. The timing of the gamma‐ray termination coincided with the moment when the leader development of the intra/inter‐cloud discharge passed 0.7 km horizontally away from the radiation monitors. The intra/inter‐cloud discharge started ∼15 km away from the gamma‐ray observation site. Therefore, the glow was terminated by the leader development, while it did not trigger the lightning discharge in the present case.
Description: 雷雲に隠れた天然の加速器を雷が破壊する瞬間を捉えた --放射線・大気電場・電波による高エネルギー大気現象の観測--. 京都大学プレスリリース. 2018-05-29.
Rights: ©2018. The Authors.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
DOI(Published Version): 10.1029/2018GL077784
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