DOI: 10.1002/2016JD025224
论文题名: Bidirectional leader development in a preexisting channel as observed in rocket-triggered lightning flashes
作者: Qie X. ; Pu Y. ; Jiang R. ; Sun Z. ; Liu M. ; Zhang H. ; Li X. ; Lu G. ; Tian Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 2 起始页码: 586
结束页码: 599
语种: 英语
英文关键词: bidirectional leader
; dart/dart-stepped leader
; preexisting channel
; recoil leader
; triggered lightning
Scopus关键词: current
; discharge
; electric field
; geophysics
; lightning
; videography
英文摘要: Two cases of bidirectional leader, starting almost immediately below a decaying dart or dart-stepped leader which terminated before reaching the ground, were identified, for the first time, in rocket-triggered lightning flashes based on high-speed video, electric field changes, and channel base current, indicating that a bidirectional leader can be excited by a decayed dart leader and propagate in a preexisting discharge channel. The positive end of the bidirectional leader moved upward along the terminated downward dart leader path, and the negative end extended downward along the decayed initial continuous current or preceding stroke path to the ground and culminated in a return stroke. The positive leader propagated with an average speed of 1.3 × 106 m/s and 2.2 × 106 m/s in the two cases, roughly twice as fast as its negative counterpart with speed of 7.8 × 105 m/s and 1.0 × 106 m/s, respectively. The positive end started earlier than the negative end with a preceding time less than 40.3 µs. The bidirectional leader can be regarded as a recoil leader with the positive end retrogressing along a negative leader channel, whose polarity is contrary to the traditional recoil leader with negative leader end retrogressing along an existing positive leader channel. Weak luminosity was continuously observed during the terminated dart leader and bidirectional leader stage, but the channel current was less than the minimum detection capability of 9.3 A. ©2016. American Geophysical Union. All Rights Reserved. 资助项目: 41375012
; 41405008
; 41505002
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62723
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; College of Meteorological Observation, Chengdu University of Information Technology, Chengdu, China
Recommended Citation:
Qie X.,Pu Y.,Jiang R.,et al. Bidirectional leader development in a preexisting channel as observed in rocket-triggered lightning flashes[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)