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DOI: 10.1002/2015GL064777
论文题名:
Unipolar and bipolar pulses emitted during the development of lightning flashes
作者: Kašpar P.; Santolík O.; Kolmašová I.
刊名: Geophysical Research Letters
ISSN: 0094-9223
EISSN: 1944-8954
出版年: 2015
卷: 42, 期:17
起始页码: 7206
结束页码: 7213
语种: 英语
英文关键词: lightning ; trains of pulses ; transmission line model
Scopus关键词: Electric fields ; Lightning protection ; Magnetic levitation vehicles ; Magnetic polarity ; Transmission line theory ; Electric field pulse ; Injected current ; Lightning flashes ; Propagation time ; Propagation velocities ; Sub-microsecond ; Trains of pulses ; Transmission line modeling ; Lightning ; electric field ; lightning ; magnetic field ; polarization ; timescale ; wave modeling ; wave propagation
英文摘要: Both unipolar and bipolar magnetic or electric field pulses have been observed during preparatory stages of a lightning flash. We introduce a new simple analytical model to describe both kinds of pulses. We show how the polarity overshoot depends on the parameters of the model, including the propagation velocity of the current pulse, the step length, and the injected current waveshape. We observe that the expression for the radiation part of the magnetic field can be decomposed into two time-shifted terms with opposite polarities. The time shift of the two terms is determined by the overall propagation time of the current pulse. The model well corresponds not only to observations of the bipolar preliminary breakdown pulses at time scales of tens of microseconds but also to both unipolar and bipolar dart-stepped leader pulses at submicrosecond time scales. ©2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943361810&doi=10.1002%2f2015GL064777&partnerID=40&md5=c19491a70104d84f3f60fee69b5c815b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8839
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: Institute of Atmospheric Physics, CAS, Prague, Czech Republic

Recommended Citation:
Kašpar P.,Santolík O.,Kolmašová I.. Unipolar and bipolar pulses emitted during the development of lightning flashes[J]. Geophysical Research Letters,2015-01-01,42(17).
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