Influence of water conductivity on micro-discharges from raindrops in strong electric fields
Influence of water conductivity on micro-discharges from raindrops in strong electric fields
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DOI：
10.1016/j.atmosres.2004.11.017
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发表时间：
2005-07
影响因子：
5.5
通讯作者：
M. Boussaton;S. Coquillat;S. Chauzy;J. Georgis
中科院分区：
文献类型：
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作者：
M. Boussaton;S. Coquillat;S. Chauzy;J. Georgis
通过将不同电导率的水滴以末端速度落在强水平电场中，研究了电导率对雨滴微放电的影响。放电起始场基本保持不变，但微放电特性明显受到缺水高幅度脉冲(低导水率)和大量低幅度脉冲(高导水率)的性质的影响。分析了导水率对起始流光脉冲放电模式的影响。人们认为，正雪崩头部的负电荷更快地被有雨水的液滴表面吸收，从而使脉冲重新激活得更快。根据最近关于污染对闪电活动的影响的研究，讨论了这种行为的可能影响。
The influence of water conductivity on micro-discharges from raindrops has been studied by submitting water drops of different conductivities, falling at terminal velocity, to strong horizontal electric fields. The discharge onset field remains quite unchanged but the micro-discharges characteristics are clearly affected by the nature of water—scarce high amplitude pulses for low water conductivity and numerous low amplitude pulses for higher water conductivity. The influence of water conductivity on the onset streamer pulse mode of discharge is analysed. It is thought that the negative charge at the head of the positive avalanche is faster absorbed by the drop surface with rainwater, thus the reactivation of the pulses is faster. Possible implications of such behaviour are discussed in the light of recent studies on the influence of pollution on lightning activity.