DOI: 10.1002/grl.50904
论文题名: Visible channel development during the initial breakdown of a natural negative cloud-to-ground flash
作者: Campos L.Z.S. ; Saba M.M.F.
刊名: Geophysical Research Letters
ISSN: 0094-8594
EISSN: 1944-8325
出版年: 2013
卷: 40, 期: 17 起始页码: 4756
结束页码: 4761
语种: 英语
英文关键词: initial breakdown
; leader
; lightning
Scopus关键词: Cloud-to-ground flash
; Electric field waveform
; Frames per seconds
; initial breakdown
; Initial breakdown pulse
; Initial development
; leader
; Leader development
; Electric fields
; Lightning
; cloud
; cloud to ground lightning
; electric field
; GPS
; lightning
; thundercloud
英文摘要: GPS time synchronized high-speed video records (at 4000 frames per second) and electric field waveforms are discussed for one stepped leader of a negative cloud-to-ground flash whose initial development becomes visible above cloud base. The leader emerges from the opaque region of the thundercloud around 4800 m above ground, propagating with speeds of the order of 106 m s -1. It is possible to see that this early, bright, and fast propagation period occurred simultaneously with the emission of initial breakdown bipolar pulse trains. The leader gradually reduces its speed and luminous intensity: When its tip is less than 3000 m above the ground, the propagation speeds oscillate between 2 and 4 × 105 m s -1 until it makes contact approximately 16 ms after it first became visible. With time, the initial breakdown waveform is gradually replaced by unipolar pulses and the leader propagation speed drops to the 105 m s-1 range. Key Points Fast visible leader development during the initial breakdown pulse activity Breakdown bipolar pulse trains become unipolar as the leader slows down ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883624418&doi=10.1002%2fgrl.50904&partnerID=40&md5=209ad3a7c5967838ab7fed8f6c502608
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5858
Appears in Collections: 气候减缓与适应
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作者单位: ELAT/CCST, National Institute for Space Research São Paulo, Av. dos Astronautas 1758, CEP São José dos Campos, SP 12227-010, Brazil
Recommended Citation:
Campos L.Z.S.,Saba M.M.F.. Visible channel development during the initial breakdown of a natural negative cloud-to-ground flash[J]. Geophysical Research Letters,2013-01-01,40(17).