DOI: 10.1002/jgrd.50804
论文题名: Bipolar cloud-to-ground lightning flash observations
作者: Saba M.M.F. ; Schumann C. ; Warner T.A. ; Helsdon Jr. J.H. ; Schulz W. ; Orville R.E.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11098
结束页码: 11106
语种: 英语
英文关键词: bipolar flash
; electric field
; high-speed video
; negative lightning
; positive lightning
Scopus关键词: Electric fields
; High speed cameras
; bipolar flash
; Cloud-to-ground lightning flash
; High-speed video
; Lightning flashes
; Negative lightning
; Polarity reversal
; Positive cloud-to-ground flashes
; Positive lightning
; Lightning protection
; cloud to ground lightning
; electrical method
; measurement method
; observational method
; polarization
; stroke
; videography
; waveform analysis
英文摘要: Bipolar lightning is usually defined as a lightning flash where the current waveform exhibits a polarity reversal. There are very few reported cases of cloud-to-ground (CG) bipolar flashes using only one channel in the literature. Reports on this type of bipolar flashes are not common due to the fact that in order to confirm that currents of both polarities follow the same channel to the ground, one necessarily needs video records. This study presents five clear observations of single-channel bipolar CG flashes. High-speed video and electric field measurement observations are used and analyzed. Based on the video images obtained and based on previous observations of positive CG flashes with high-speed cameras, we suggest that positive leader branches which do not participate in the initial return stroke of a positive cloud-to-ground flash later generate recoil leaders whose negative ends, upon reaching the branch point, traverse the return stroke channel path to the ground resulting in a subsequent return stroke of opposite polarity. Key Points Existence of single-channel bipolar flashes Common characteristics of bipolar flashes How can positive and negative discharges use the same path to ground? ©2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1048103
; ATM-0813672
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63245
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: National Institute for Space Research, INPE, Av dos Astronautas, 1758, S. José dos Campos, SP, 12227-010, Brazil; South Dakota School of Mines and Technology, Rapid City SD, United States; Austrian Lighting Detection and Information System, Vienna, Austria; Texas AandM University, College Station TX, United States
Recommended Citation:
Saba M.M.F.,Schumann C.,Warner T.A.,et al. Bipolar cloud-to-ground lightning flash observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)