DOI: 10.1002/2015JD023417
论文题名: An M component with a concurrent dart leader traveling along different paths during a lightning flash
作者: Stolzenburg M. ; Marshall T.C. ; Karunarathne S. ; Karunarathna N. ; Orville R.E.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2015
卷: 120, 期: 19 起始页码: 10267
结束页码: 10284
语种: 英语
英文关键词: dart leader
; high-speed video
; interstroke interval
; M component
Scopus关键词: amplitude
; atmospheric electricity
; cloud to ground lightning
; electric field
; luminescence
; velocity profile
; wave propagation
英文摘要: Utilizing time-correlated high-speed video and electric field change data, a seven-stroke lightning flash is described in which the fifth return stroke (RS) occurs 0.80 ms after the fourth RS connects to a different ground location 3.3 km away. The fifth RS is 0.34 ms after an M component starts down the different channel. The fifth stroke involves a dart leader traveling concurrently, though slower than the M component, in a prior channel to ground. There was no indication of leader advance along this path earlier during the fourth RS. The fourth stroke involves a stepped leader that started from the end of an observed prior dart leader branch which did not previously propagate to ground. The concurrent M component and dart leader are preceded by an in-cloud event evidenced by a large-amplitude, fast electric field change pulse, at 6.1 km estimated altitude, inferred as the connection to the channel for the M component. The M component current apparently initiates the dart leader about 40 μs later. A visible channel length of 10,400 m allows for the 2-D propagation speed of the M component luminosity to be estimated in the range of 1.0 to 1.2 × 108 m s-1. The concurrent dart leader travels a visible length of 3445 m with 2-D speed of 1.7 × 107 m s-1, similar to other dart leaders in this flash. Luminosity evolution along the channel through the RS and M component is also described. Estimated optical risetimes of three separate M components are 80-200 μs at 520 m above ground. ©2015. 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/63012
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Physics and Astronomy, University of Mississippi, University, MS, United States; Department of Atmospheric Sciences, Texas AandM University, College Station, TX, United States
Recommended Citation:
Stolzenburg M.,Marshall T.C.,Karunarathne S.,et al. An M component with a concurrent dart leader traveling along different paths during a lightning flash[J]. Journal of Geophysical Research: Atmospheres,2015-01-01,120(19)