DOI: 10.1002/jgrd.50446
论文题名: Evolution of line charge density of steadily-developing upward positive leaders in triggered lightning
作者: Chen M. ; Zheng D. ; Du Y. ; Zhang Y.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4670
结束页码: 4678
语种: 英语
英文关键词: charge density
; Rocket-triggered lightning
; upward positive leader
Scopus关键词: Lightning
; Rockets
; Electrical field
; Ground observations
; High-speed camera image
; Keypoints
; Temporal and spatial evolutions
; Triggered lightning
; Upward positive leaders
; Charge density
; altitude
; current
; density
; electric field
; lightning
英文摘要: We present an approach for retrieving the temporal and spatial evolution of the charge density and the current of a steadily-developing upward leader based on ground observations of electrical fields and high speed camera images of two upward positive leaders initiated by a classical rocket-triggered lightning before the wire disintegration. For a period of a few milliseconds, for the upward leader segments developing above altitude about 200 m, we obtained the leader speed, calculated the leader charge density and the leader current. For the two leaders, both the leader speed and the charge density, hence the leader current, showed a trend of increase as the leader propagated upward. There was a good consistency in the variation trend between the calculated leader current and the leader channel brightness. The leader current calculated agreed well with the current measured at the channel base, indicating that our proposed model for retrieving the leader charge density is effective and reliable. Key Points A method for estimating charge density of upward leader is suggested.The method is applied to 2 upward positive leaders in triggered lightning.The leader charge density shows an increase with the height. ©2013. 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/63737
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: Department of Building Services Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Laboratory of Lightning Physics and Protection Engineering, Chinese Academy of Meteorological Sciences, Beijing, China
Recommended Citation:
Chen M.,Zheng D.,Du Y.,et al. Evolution of line charge density of steadily-developing upward positive leaders in triggered lightning[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)