DOI: 10.1002/2013GL058060
论文题名: Lightning attachment process involving connection of the downward negative leader to the lateral surface of the upward connecting leader
作者: Lu W. ; Chen L. ; Ma Y. ; Rakov V.A. ; Gao Y. ; Zhang Y. ; Yin Q. ; Zhang Y.
刊名: Geophysical Research Letters
ISSN: 0094-8452
EISSN: 1944-8183
出版年: 2013
卷: 40, 期: 20 起始页码: 5531
结束页码: 5535
语种: 英语
英文关键词: downward leader
; lightning attachment process
; lightning discharge
; upward connecting leader
Scopus关键词: Attachment process
; Connecting leaders
; Downward leaders
; High speed video cameras
; Lightning attachment
; Lightning discharge
; Negative lightning
; Temporal resolution
; Earth sciences
; Geophysics
; Lightning protection
; lightning
; pixel
; spatial resolution
英文摘要: High-speed video camera records, with a temporal resolution of 20 μs and a spatial resolution of 2.4 m per pixel, of a downward negative lightning flash that terminated on a 440 m high building are examined. The attachment process in this flash exhibited an unexpected behavior in that the downward leader tip connected to the lateral surface of the ∼400 m upward connecting leader (UCL) below its tip. It appears that the effect of the downward leader on the UCL is significant, while the effect of the UCL on the downward leader is negligible, except for the final 80 μs preceding the beginning of the first return stroke. The ratio of speeds of the downward leader and the UCL tends to decrease with time, ranging from 1.8 to 0.12, although the lower 80-100 m or so of the UCL were too faint to allow speed measurements. Key Points Downward leader can make contact with upward leader below its tip Ratio of speeds of downward and upward leaders tends to decrease with time Mutual influence of downward and upward leaders is discussed ©2013 The Authors. Geophysical Research Letters published by Wiley on behalf of the American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84886905774&doi=10.1002%2f2013GL058060&partnerID=40&md5=47bc08ce22002837689e42f0031db778
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5716
Appears in Collections: 气候减缓与适应
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作者单位: Laboratory of Lightning Physics and Protection Engineering, Chinese Academy of Meteorological Sciences, No. 46 Zhongguancun South Ave., Haidian District, Beijing 100081, China
Recommended Citation:
Lu W.,Chen L.,Ma Y.,et al. Lightning attachment process involving connection of the downward negative leader to the lateral surface of the upward connecting leader[J]. Geophysical Research Letters,2013-01-01,40(20).