An analysis of the initial breakdown pulse for positive cloud-to-ground flashes

Yang Zhang, Yijun Zhang, Weitao Lu, D. Zheng, Q. Meng
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引用次数: 8

Abstract

In order to further understand the initiating mechanism of positive cloud-to-ground (PCG) flashes, the nature and temporal characteristics of the positive breakdown pulse trains are investigated by electric field data in Conghua of Guangdong province. Considering the difference between the initial polarity of initial breakdown pulses and the first return stoke (RS), three types of bipolar pulse trains, including the same polarity, the opposite polarity and the both polarity, are identified. The percentages are 83.5%, 10% and 5.5%, respectively. The statistic results show that PCG flash with breakdown pulse trains, which occur when the amount of PCG flash is little, is about 11.6% of the total PCG flashes. The average time interval between the peak of adjacent pulses and pulse duration are 270.99 μs and 25.01 μs, respectively. The mean value of pulse train duration and the interval between PBP train and RS is 8.88 ms and 98.48ms, respectively. The average ratio of all samples between the maximum amplitude of pulse train and the amplitude of the first stroke pulse is 0.16. The ratio is smaller in of Guangzhou province than in Hokuriku coast in Japan.
云对地正闪的初始击穿脉冲分析
为了进一步了解云对地正闪的产生机理,利用广东从化地区的电场数据,研究了云对地正闪击穿脉冲序列的性质和时间特征。考虑到初始击穿脉冲的初始极性与第一次返回脉冲(RS)的差异,确定了相同极性、相反极性和双极性三种类型的双极性脉冲串。比例分别为83.5%、10%和5.5%。统计结果表明,击穿脉冲串闪约占总闪数的11.6%,发生在闪量较少时。相邻脉冲峰值和脉冲持续时间的平均间隔分别为270.99 μs和25.01 μs。脉冲序列持续时间均值为8.88 ms, PBP序列与RS间隔均值为98.48ms。脉冲序列的最大幅值与第一冲程脉冲幅值的平均比值为0.16。广州的这一比例比日本北陆沿海地区要小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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