DOI: 10.1002/2014GL062911
论文题名: Observations of corona in triggered dart-stepped leaders
作者: Gamerota W.R. ; Uman M.A. ; Hill J.D. ; Jordan D.M.
刊名: Geophysical Research Letters
ISSN: 0094-8857
EISSN: 1944-8588
出版年: 2015
卷: 42, 期: 6 起始页码: 1977
结束页码: 1983
语种: 英语
英文关键词: corona
; dart-stepped leader
; lightning
; X-ray
Scopus关键词: Electric fields
; High speed cameras
; Lightning
; X rays
; Corona
; Critical component
; High electric fields
; High-speed video
; Lightning leader
; Runaway electrons
; Stepped leader
; Triggered lightning
; Electric corona
; altitude
; corona
; electric field
; electron
; seasonal variation
; wave propagation
; Florida [United States]
; United States
英文摘要: Corona streamers are a critical component of lightning leader step formation and are postulated to produce the very high electric fields at their tips that produce runaway electrons resulting in the observed X-ray bursts associated with leader stepping. Corona emanating from the vicinity of the leader tip between leader steps was analyzed using three sequential high-speed video sequences of dart-stepped leaders in three different triggered lightning flashes during the summers of 2013 and 2014 in northeast Florida. Images were recorded at 648 kiloframes per second (1.16μs exposure time, 380ns dead time) at an altitude of 65m or less. In each image sequence, the leader propagates downward in consecutive frames, with corona streamers observed to fan outward from the bright leader tip in less than the image frame time of about 1.5μs. In 21 exposures, corona streamers propagate, on average, 9m below the bright leader tip. Key Points Corona streamers imaged in three dart-stepped leaders near ground Average streamer length about 9m Side corona duration less than 1.54μs ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927783776&doi=10.1002%2f2014GL062911&partnerID=40&md5=303f638070bc133da9fe042cff51ba22
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8473
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, United States
Recommended Citation:
Gamerota W.R.,Uman M.A.,Hill J.D.,et al. Observations of corona in triggered dart-stepped leaders[J]. Geophysical Research Letters,2015-01-01,42(6).