DOI: 10.1002/2014GL060585
论文题名: High-speed video evidence of a dart leader with bidirectional development
作者: Jiang R. ; Wu Z. ; Qie X. ; Wang D. ; Liu M.
刊名: Geophysical Research Letters
ISSN: 0094-9950
EISSN: 1944-9681
出版年: 2014
卷: 41, 期: 14 起始页码: 5246
结束页码: 5250
语种: 英语
英文关键词: bidirectional
; dart leader
; lightning
; propagation
Scopus关键词: Lightning
; Lightning protection
; Wave propagation
; bidirectional
; Bidirectional leader
; Cloud-to-ground lightning flash
; dart leader
; Electric field change
; High-speed video
; Negative polarity
; Positive polarity
; High speed cameras
; bidirectional reflectance
; cloud to ground lightning
; electric field
; optical method
英文摘要: An upward negative cloud-to-ground lightning flash initiated from a high structure was detected by a high-speed camera operated at 10,000 fps, together with the coordinated measurement of electric field changes. Bidirectional propagation of a dart leader developing through the preconditioned channel was observed for the first time by optical means. The leader initially propagated downward through the upper channel with decreasing luminosity and speed and terminated at an altitude of about 2200 m. Subsequently, it restarted the development with both upward and downward channel extensions. The 2-D partial speed of the leader's upward propagation with positive polarity ranged between 3.2 × 106 m/s and 1.1 × 107 m/s with an average value of 6.4 × 106 m/s, while the speeds of the downward propagation with negative polarity ranged between 1.0 and 3.2 × 106 m/s with an average value of 2.2 × 106 m/s. The downward propagation of the bidirectional leader eventually reached the ground and induced a subsequent return stroke. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904535376&doi=10.1002%2f2014GL060585&partnerID=40&md5=1d6de4d59ce5ed3309e625d65467adb7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7214
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Jiang R.,Wu Z.,Qie X.,et al. High-speed video evidence of a dart leader with bidirectional development[J]. Geophysical Research Letters,2014-01-01,41(14).