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DOI	10.1029/2020JD034043
	On the Initiation of Upward Negative Lightning by Nearby Lightning Activity: An Analytical Approach
	Sunjerga A.; Rubinstein M.; Rachidi F.; Cooray V.
发表日期	2021
ISSN	2169897X
卷号	126 期号:5
英文摘要	Upward lightning occurs generally from tall structures. The mechanism of the initiation of upward lightning is not yet fully understood. Upward lightning can be classified into two categories based on either the absence or the presence of other lightning activity prior to the upward flash. This work proposes an explanation of how upward lightning flashes can be triggered by nearby lightning activity. It is generally thought that the lightning activity prior to the flash will intensify the electric field at the tip of the tall structures. However, to the best of our knowledge, no attempt has been made to evaluate theoretically this hypothesis. In this paper, we derive analytically the electric field enhancement on the ground (or at the top of tall structures) based on different triggering scenarios. These fields are later used in a simplified corona model to evaluate if they are able to trigger upward lightning. It is shown that both slow processes such as leader propagation and faster return strokes can trigger an upward negative flash from relatively short structures of a few tens of meters, even without any slowly varying background electric field. This study confirms theoretically experimental observations and it provides new insights into the mechanisms of initiation of upward flashes from tall structures. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	analytical; corona; criteria; electrostatic; initiation; lightning; nearby lightning; other-triggered; sustained leader; tall structure; upward
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185437
作者单位	Electromagnetic Compatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland; University of Applied Sciences of Western Switzerland (HES-SO), Yverdon-les-Bains, Switzerland; Department of Engineering Sciences, Uppsala University, Uppsala, Sweden
推荐引用方式 GB/T 7714	Sunjerga A.,Rubinstein M.,Rachidi F.,et al. On the Initiation of Upward Negative Lightning by Nearby Lightning Activity: An Analytical Approach[J],2021,126(5).
APA	Sunjerga A.,Rubinstein M.,Rachidi F.,&Cooray V..(2021).On the Initiation of Upward Negative Lightning by Nearby Lightning Activity: An Analytical Approach.Journal of Geophysical Research: Atmospheres,126(5).
MLA	Sunjerga A.,et al."On the Initiation of Upward Negative Lightning by Nearby Lightning Activity: An Analytical Approach".Journal of Geophysical Research: Atmospheres 126.5(2021).