气候变化领域集成服务门户(CCPortal): A study of lightning flash initiation prior to the first initial breakdown pulse

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DOI	10.1016/j.atmosres.2018.10.013
	A study of lightning flash initiation prior to the first initial breakdown pulse
	Marshall T.; Bandara S.; Karunarathne N.; Karunarathne S.; Kolmasova I.; Siedlecki R.; Stolzenburg M.
发表日期	2019
ISSN	0169-8095
起始页码	10
结束页码	23
卷号	217
英文摘要	This study examines the initiation of two intracloud (IC) and two cloud-to-ground (CG) lightning flashes using electric field change (FA) sensors and VHF (LogRF) sensors located at seven sites near Oxford, Mississippi, USA. For each flash the initiating event caused a pulse in the LogRF data and started an Initial E-Change (IEC) in the FA data. The initiating LogRF pulses had powers <1 W and durations of ~1 μs. Numerous LogRF pulses occurred during each IEC; these pulses had durations ≤3 μs. Fewer FA pulses occurred during each IEC; these pulses had durations of ≤7 μs. During each IEC, a few of the LogRF pulses were coincident with a FA pulse, and most such pairs of pulses enhanced the IEC; no IEC enhancing events occurred without such a coincident pair. Each flash had 1 or 2 IEC enhancing events soon after the initiating event and 1 or 2 enhancing events shortly before the first classic initial breakdown (IB) pulse occurred. The point dipole moments and durations of IECs of the two IC flashes were (–520C m, 620 μs) and (–770C m, 1790 μs) and for the two CG flashes were (9C m, 124 μs) and (36C m, 130 μs). We speculate that the LogRF events were positive corona streamers, that enhancing events occurred when a new streamer extended a previous streamer path, and that this process during the flash initiation developed a nascent channel needed for the negative breakdown of the IB pulses. © 2018 The Authors
英文关键词	Initial breakdown pulse; Initial lightning breakdown; Lightning; Lightning initiation
语种	英语
scopus关键词	Integrated circuits; Lightning; Lightning protection; Cloud-to-ground lightning; Electric field change; Initial breakdown pulse; Initial lightning breakdown; Initiating events; Lightning flashes; Lightning initiation; Positive corona; Clouds; atmospheric electricity; cloud to ground lightning; corona; electric field; sensor; Mississippi; United States
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162162
作者单位	Department of Physics & Astronomy, University of Mississippi, University, MS 38677, United States; Department of Space Physics, Institute of Atmospheric Physics CAS, Prague, Czech Republic; Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic; Baptist College of Health Sciences, Memphis, TN 38104, United States
推荐引用方式 GB/T 7714	Marshall T.,Bandara S.,Karunarathne N.,et al. A study of lightning flash initiation prior to the first initial breakdown pulse[J],2019,217.
APA	Marshall T..,Bandara S..,Karunarathne N..,Karunarathne S..,Kolmasova I..,...&Stolzenburg M..(2019).A study of lightning flash initiation prior to the first initial breakdown pulse.Atmospheric Research,217.
MLA	Marshall T.,et al."A study of lightning flash initiation prior to the first initial breakdown pulse".Atmospheric Research 217(2019).