Luminous Crown Residual Vs. Bright Space Segment: Characteristical Structures for the Intermittent Positive and Negative Leaders of Triggered Lightning

被引：27

作者：

Jiang, Rubin ^{[1
,2
]}

Qie, Xiushu ^{[1
,2
,3
]}

Li, ZongXiang ^{[1
,4
]}

Zhang, Hongbo ^{[1
]}

Li, Xiao ^{[1
,3
]}

Yuan, Shanfeng ^{[1
]}

Liu, Mingyuan ^{[1
,3
]}

Sun, Zhuling ^{[1
]}

Srivastava, Abhay ^{[1
]}

Liu, Minzhi ^{[2
]}

Ma, Zilong ^{[2
]}

Lv, Guanlin ^{[1
,4
]}

机构：

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

[2] Nanjing Univ Informat Sci & Technol, Key Lab Aerosol Cloud Precipitat China Meteorol A, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Peoples R China

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

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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 21期

基金：

中国国家自然科学基金;

关键词：

lightning; leader; step; streamer; propagation; INITIAL-STAGE; PROPAGATION; PHYSICS;

D O I：

10.1029/2020GL088107

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We identify and investigate the intermittent propagation of upward positive and negative leaders in rocket-triggered lightning based on comprehensive observations of fine time-resolved optical, current, and electromagnetic fields. There is an abrupt luminous crown blooming due to the achievement of a positive leader step, after which the channel weakens and the head degrades. During the positive leader pausing, residual structure is recognized at area of previous luminous crown blooming, in the form of a floating segment. Our observation point to a possible mechanism that it connects with the positive leader head, causing a forward-step and a sharp current pulse. This is to some extent similar to negative leader stepping, in which the space leader emerges and connection between the space leader and the channel head occurs. The generation of clustered space leaders give rise to negative channel branching, but the residual structure in positive leader just leads to individual step.

引用

页数：9

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