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On the interpeak interval of unipolar pulses of current preceding the return stroke in negative CG lightning

机译：在负CG闪电中返回行程之前的电流单极脉冲的峰间间隔

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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 mu s range, with an average of about 40 mu s. This result is significantly different from that published in literature, derived from electric field records, that reports interpeak intervals ranging from 1 to 100 mu s and an average of about 10-20 mu s.
机译：关于负CG闪电的返回前冲程阶段的特征，就其沿接地结构感应出的电流的单极脉冲进行了讨论。讨论基于两个视频，同时记录了Morro do Cachimbo站获得的闪光电流和电场。传统上，由负引导线接近地面的步骤感应的这些脉冲用于揭示该引导线的传播特性。结果表明，向下引导的不同分支负责诱导特定的脉冲序列。应用了一种程序，以在大量测得的雷电电流中区分此类序列，并根据记录的18次闪烁和20条未连接的引导线估计了它们的峰间间隔。发现这些间隔主要在30-50 s s范围内，平均约40 s s。该结果与从电场记录中得出的文献中公布的结果大不相同，后者报告的峰间间隔为1至100μs，平均约为10-20μs。

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