Negative excursion of surface electric fields during gamma-ray glows in winter thunderstorms

和田 有希*; 鴨川 仁*; 久保 守*; 榎戸 輝揚*; 林 省吾*; 澤野 達也*; 米徳 大輔*; 土屋 晴文

Journal of Geophysical Research; Atmospheres, 128(21), p.e2023JD039354_1 - e2023JD039354_20, 2023/11

https://doi.org/10.1029/2023JD039354

During the 2020-2021 winter season, we detected 6 gamma-ray glows at Kanazawa University, Japan. Negative surface electric fields (E-fields) were observed by a field mill during all the glow cases. In five of the six cases, the maximum E-field reached 12 , and the E-field during the glow detection was the strongest in 3 hours before and after the detection time. Therefore, negative charges should have been dominant in the thunderclouds that produced the gamma-ray glows, and electrons were probably accelerated and multiplied by the E-fields between a predominantly negative charge layer and a localized positive charge layer below. In addition, we extracted 8 non-detection cases in the 2020-2021 winter season, in which surface E-fields were stronger than 12 . In 5 of the 8 cases, radar echoes were inadequately developed, suggesting insufficient charge accumulation. On the other hand, the remaining 3 cases had well-developed radar echoes, and there was no significant difference from the detection cases.

多数の線電流が作る磁場の計算プログラム; 臨界プラズマ試験装置設計報告,20

吉田 吉一*; 斎藤 龍太*; 関 省吾; 狐崎 晶雄; 小林 哲郎*; 小林 朋文*; 嶋田 隆一; 田村 早苗; 谷 啓二

JAERI-M 6470, 14 Pages, 1976/03

JAERI-M-6470.pdf:0.45MB

大型トカマク装置のポロイダル磁場コイルについて、実際のコイル構造により生ずる不整磁場を評価するため、コイルの接続部、給電線の構造などを考慮して磁場を計算するプログラムを作成した。