Fine Structure of the Breakthrough Phase of the Attachment Process in a Natural Lightning Flash

被引：20

作者：

Jiang, Rubin ^{[1
]}

Srivastava, Abhay ^{[1
,2
]}

Qie, Xiushu ^{[1
,4
]}

Yuan, Shanfeng ^{[1
]}

Zhang, Hongbo ^{[1
]}

Sun, Zhuling ^{[1
]}

Wang, Dongfang ^{[1
]}

Wang, Caixia ^{[3
]}

Lv, Guanlin ^{[5
]}

Li, Zongxiang ^{[5
]}

机构：

[1] Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing, Peoples R China

[2] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China

[3] Beijing Informat Sci & Technol Univ, Coll Sci, Beijing, Peoples R China

[4] North Eastern Space Applicat Ctr, Space & Atmospher Sci Div, Dept Space, Shillong, Meghalaya, India

[5] Chengdu Univ Informat Technol, Coll Elect Engn, Chengdu, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2021年 / 48卷 / 06期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

attachment process; breakthrough phase; common streamer zone; leader; lightning;

D O I：

10.1029/2020GL091608

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A lightning flash striking a 325-m tower was captured using a high-speed camera operated at 380 kfps and the characteristics of breakthrough phase (BTP) were recorded in two consecutive frames. The fine time-resolved images indicate that the common streamer zone (CSZ) formed when the bright tips of negative and positive leaders were >= 23 m apart from each other. During BTP, both the negative and positive leaders extended their channels with enhanced luminosity and the gap between them was shortened to 16 m in the frame prior to return stroke. A space leader-like luminous segment was found within the route of leader connection. This route is inferred to have already been determined at the initial formation of CSZ, by the interconnected streamers of approaching leaders. The dominant growth of this route is interpreted as a new scenario for the conversion of a high-impedance CSZ to a hot plasma channel during BTP.

引用

页数：9

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