闪电(连接器)
电场
峰值电流
电流(流体)
航程(航空)
区间(图论)
心理学
物理
数学
工程类
组合数学
功率(物理)
航空航天工程
热力学
量子力学
电化学
电极
作者
Marcelo Arcanjo,Miguel Guimarães,Silvério Visacro
标识
DOI:10.1016/j.epsr.2019.03.028
摘要
Features of the pre-return stroke phase of negative CG lightning are discussed with respect to their unipolar pulses of current induced along grounded structures. Discussions are based on two videos and simultaneous records of current and electric field of flashes obtained at Morro do Cachimbo Station. Traditionally, these pulses induced by the steps of the negative leader approaching the ground are used for revealing propagation characteristics of this leader. It is shown that different branches of the downward leader are responsible for inducing specific sequences of pulses. A procedure was applied for distinguishing such sequences in a significant number of measured lightning currents and their interpeak intervals were estimated from records of current of 18 flashes and 20 unconnected leaders. These intervals were found to be mostly in the 30–50 μs range, with an average of about 40 μs. This result is significantly different from that published in literature, derived from electric field records, that reports interpeak intervals ranging from 1 to 100 μs and an average of about 10–20 μs.
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