气候变化领域集成服务门户(CCPortal): A Comparison on the E-Change Pulses Occurring in the Bi-Level Polarity-Opposite Charge Regions of the Intracloud Lightning Flashes

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DOI	10.1029/2020JD032996
	A Comparison on the E-Change Pulses Occurring in the Bi-Level Polarity-Opposite Charge Regions of the Intracloud Lightning Flashes
	Shi D.; Wang D.; Wu T.; Takagi N.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	We have compared the E-change pulses occurring in the upper positive charge region (UPCR) and the middle negative charge region (MNCR) of 41 normal intracloud (IC) flashes. E-change pulses can be roughly grouped into isolated pulses and pulse trains with both positive and negative polarities. Although isolated pulses occurred about equally in UPCR and MNCR, there were much more pulse trains in MNCR than UPCR. Overall, the average amplitude, rise time, half-peak width, and fall time of isolated pulses (pulse trains) are 56% larger (115% larger), 31% faster (43% slower), 25% narrower (46% wider), and 26% shorter (62% longer) in UPCR than in MNCR. Interestingly, in the same charge region, positive and negative pulses share similar characteristics. Based on a typical well-structured IC, it was found that the majority of isolated pulses in both UPCR and MNCR occurred at or close to the leader tips. In contrast, about 30% UPCR pulse trains occurred at or close to the tip, while the remaining 70% pulse trains occurred in the leader channel retracing along the leader channel away from the flash origin; for MNCR pulse trains, about 60% occurred close to the tip, and 40% occurred in the channel with a backward extension to the flash origin. Based on these characteristics, we have discussed the physical nature of various types of pulses and pointed out that a leader is likely to progress with a fluctuating behavior when it is neutralizing space charge distributed in a region with sufficient thickness and width. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	bi-level charge regions; E-change pulses; intracloud lightning
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185807
作者单位	Department of Electrical, Electronic and Computer Engineering, Gifu University, Gifu, Japan
推荐引用方式 GB/T 7714	Shi D.,Wang D.,Wu T.,et al. A Comparison on the E-Change Pulses Occurring in the Bi-Level Polarity-Opposite Charge Regions of the Intracloud Lightning Flashes[J],2020,125(17).
APA	Shi D.,Wang D.,Wu T.,&Takagi N..(2020).A Comparison on the E-Change Pulses Occurring in the Bi-Level Polarity-Opposite Charge Regions of the Intracloud Lightning Flashes.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Shi D.,et al."A Comparison on the E-Change Pulses Occurring in the Bi-Level Polarity-Opposite Charge Regions of the Intracloud Lightning Flashes".Journal of Geophysical Research: Atmospheres 125.17(2020).