DOI: 10.1002/2014GL060913
论文题名: Properties of the unusually short pulse sequences occurring prior to the first strokes of negative cloud-to-ground lightning flashes
作者: Kolmašová I. ; Santolík O. ; Farges T. ; Rison W. ; Lán R. ; Uhlíř L.
刊名: Geophysical Research Letters
ISSN: 0094-9949
EISSN: 1944-9680
出版年: 2014
卷: 41, 期: 14 起始页码: 5316
结束页码: 5324
语种: 英语
英文关键词: duration of breakdown process
; lightning initiation
; preliminary breakdown pulses
Scopus关键词: Earth sciences
; Geophysics
; Breakdown process
; Cloud-to-ground lightning flash
; Lightning initiation
; Magnetic and electric fields
; preliminary breakdown pulses
; Propagation speed
; Short durations
; Simultaneous observation
; Thunderstorms
; amplitude
; electromagnetic field
; lightning
; seasonal variation
; thundercloud
; velocity profile
英文摘要: We analyze broadband magnetic and electric field measurements of pulse sequences occurring prior to first return strokes of negative cloud-to-ground lightning flashes. Our observations take place a few tens of kilometers from the thunderstorm but we also report the first simultaneous observations of preliminary breakdown pulses from a distance of 400 km. Their amplitudes reach up to 50% of the corresponding return stroke peak and typically decrease by ~40% during the sequences. A typical time interval between neighboring pulses was several tens of microseconds. We observe an unusually short duration of the prestroke activity (1-7 ms) reported for the first time during a summer thunderstorm, with a low height of initiation (3-4 km). A very fast propagation speed (~106 m/s) is probably maintained for the entire prestroke process. A possible explanation can be based on a hypothesis of unusually strong negative charge sources in the observed thundercloud. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904850214&doi=10.1002%2f2014GL060913&partnerID=40&md5=80a5ed6b33c8a9bf73dfee7634383af0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7213
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Atmospheric Physics AS CR, Prague, Czech Republic
Recommended Citation:
Kolmašová I.,Santolík O.,Farges T.,et al. Properties of the unusually short pulse sequences occurring prior to the first strokes of negative cloud-to-ground lightning flashes[J]. Geophysical Research Letters,2014-01-01,41(14).