DOI: 10.1029/2018JD028407
Scopus记录号: 2-s2.0-85050603926
论文题名: Initiation of Streamers Due to Hydrometeor Collisions in Thunderclouds
作者: Cai Q. ; Jánský J. ; Pasko V.P.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 14 起始页码: 7050
结束页码: 7064
语种: 英语
英文关键词: avalanche
; avalanche-to-streamer transition
; collision frequency
; electron multiplication
; Meek criterion
; streamer
英文摘要: In order to initiate streamers and leaders under thunderstorm conditions the electric field should reach values higher than the critical breakdown field Ek (i.e., ∼30 kV·cm−1·atm−1). However, the maximum electric field in thunderstorms measured by balloons is ∼6–9 kV·cm−1·atm−1. In present work, to achieve the electric field amplification required for streamer initiation, a system of two approaching spherical hydrometeors is investigated. Streamer initiation is determined from a Meek number, describing electron multiplication in fields above Ek. We have found the relationships between radii of particles for successful streamer initiation in the gap between these two particles and also on the outside periphery of the two particle system when the particles are connected by a discharge channel. Furthermore, we estimated the frequency of streamer initiation using three realistic hydrometeor size model distributions available in the literature and found that the scenario of streamer initiation on the outside periphery is only possible for relatively high electric fields ≥0.5Ek at altitudes of 3 and 6 km. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113500
Appears in Collections: 气候减缓与适应
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作者单位: CSSL Laboratory, Department of Electric Engineering, School of Electrical Engineering and Computer Science, The Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Cai Q.,Jánský J.,Pasko V.P.. Initiation of Streamers Due to Hydrometeor Collisions in Thunderclouds[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(14)