DOI: 10.1002/jgrd.50766
论文题名: Initiation processes of return strokes in rocket-triggered lightning
作者: Wang D. ; Takagi N. ; Gamerota W.R. ; Uman M.A. ; Hill J.D. ; Jordan D.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 9880
结束页码: 9888
语种: 英语
英文关键词: lightning
; lightning attachment
; return stroke
Scopus关键词: Image resolution
; Lightning
; Lightning protection
; Rockets
; Initiation process
; Lightning attachment
; Lightning flashes
; Optical imaging system
; Propagation speed
; Return stroke
; Termination points
; Time resolution
; Speed
; estimation method
; height
; lightning
; resolution
英文摘要: Using a high speed optical imaging system operated at a time resolution of either 10 ns or 100 ns, we have documented the initiation process of 14 return strokes in four rocket-triggered lightning flashes. Of the 14 strokes, nine occurred following dart leaders and five following dart-stepped leaders. The return strokes are found to initiate at heights ranging from 7.2 ± 1.4 to 21.0 ± 4.6 m above the lightning termination point. Return strokes with larger peak current tend to initiate higher. All the return strokes show initial bidirectional (upward and downward from their initiation height) propagation. We have been able to estimate the initial upward propagation speeds below 60 m for all of the return strokes. The resultant speeds range from 0.4 × 108 to 2.5 × 108 m/s. For the downward propagation speeds, only six strokes among the 14 strokes allow us to perform a reasonable estimation. Those downward speeds range from 0.6 × 108 to 1.9 × 108 m/s. Key Points Return strokes with larger peak current tend to initiate higher.All the return strokes show initial bidirectional propagationThe downward speeds of two return strokes were measured. ©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/63325
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 Electrical, Electric and Computer Engineering, Gifu University, Gifu, 501-1112, Japan; Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, United States
Recommended Citation:
Wang D.,Takagi N.,Gamerota W.R.,et al. Initiation processes of return strokes in rocket-triggered lightning[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)