DOI: 10.1002/2013JD019910
论文题名: High-speed video observations of a natural negative stepped leader and subsequent dart-stepped leader
作者: Petersen D.A. ; Beasley W.H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 12110
结束页码: 12119
语种: 英语
英文关键词: dart leader
; lightning
; sferics
; space leader
; stepped leader
Scopus关键词: Atmospherics
; Electric fields
; High speed cameras
; Luminance
; Avalanche photo-diode arrays
; dart leader
; Decaying return stroke
; Discharge structures
; High speed video cameras
; Identical structures
; space leader
; Stepped leader
; Lightning
; corona
; electric field
; laboratory method
; lightning
; microwave radiation
; time domain reflectometry
; videography
英文摘要: We present new high-speed video observations of a natural negative stepped leader and a subsequent negative dart-stepped leader. Observations were made at a distance of 770 m using a high-speed video camera at 10,000 frames per second, a microwave-frequency radio receiver, a broadband electric field antenna, and an avalanche photodiode array. Lightning leader breakdown was observed in detail for both the negative stepped leader and the subsequent dart-stepped leader. During the negative stepped leader breakdown, detailed images were captured of the discharge structures near the leader tips. These structures bear a remarkable resemblance to the corona streamer zone and space leader discharges that have been observed in laboratory-generated negative stepped leaders. During the dart-stepped leader breakdown, no corona streamer zone was observed outside of the decaying return stroke channel, but small luminous structures that are suggestive of space leaders were observed just ahead of the main dart leader tip. Two distinct low-luminosity zones were observed just ahead of the dart leader tip, suggestive of two distinct breakdown regimes. A multipath junction was observed in the main channel to ground following the first return stroke but was not observed following the second return stroke. Finally, microwave-frequency radio emissions for both leader types and their return strokes were recorded, and their time domain behavior is compared and discussed. Key Points Lightning stepped and dart leaders observed with high-speed camera Identical structure for lightning and laboratory stepped leader Novel low-luminosity structure observed ahead of dart-stepped leader ©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/63194
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: School of Meteorology, University of Oklahoma, Norman, OK 73072, United States
Recommended Citation:
Petersen D.A.,Beasley W.H.. High-speed video observations of a natural negative stepped leader and subsequent dart-stepped leader[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)