Observational Evidence of Negative Leader Reactivation Processes Following a Negative Return Stroke in Lightning Discharges

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2024-11-01 DOI:10.1029/2023GL107685
Huaifei Chen, Weijiang Chen, Yu Wang, Nianwen Xiang, Kejie Li, Zhong Fu, Hengxin He, Lilang Xiao
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Abstract

High-time-resolved mapping results of two rare reactivation processes following a negative return stroke are discovered and analyzed. At first, the discharges prior to the reactivation process were dominated by positive discharges lasting for tens of milliseconds in a limited space in the vicinity of a decayed negative leader channel. The positive discharges produced no detectable electric field change. Then, negative discharges started and propagated along the decayed downward negative leader channels at a speed exceeding 106 m/s for a few microseconds and produced negative electric field changes. The analysis reveals that the processes are physically distinct from recoil leaders and side discharges in terms of propagation behaviors, electromagnetic characteristics, and time scale. The possible mechanisms of the processes are discussed. The observation suggests that the reactivation processes of the negative leaders may lead to subsequent return strokes.

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闪电放电中负回击后负引线再激活过程的观察证据
发现并分析了负回波冲程后两个罕见再激活过程的高时间分辨绘图结果。首先,再激活过程之前的放电主要是正放电,在衰减的负引线通道附近的有限空间内持续数十毫秒。正放电不产生可检测到的电场变化。然后,负放电开始并以超过 106 米/秒的速度沿着衰减的向下负引线通道传播了几微秒,并产生了负电场变化。分析表明,这些过程在传播行为、电磁特性和时间尺度方面与反冲引线和侧放电在物理上截然不同。本文还讨论了这些过程的可能机制。观测结果表明,负电领导的再激活过程可能会导致随后的回冲。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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