対地雷放電開始時刻の確率分布への電荷生成の揺らぎの影響

概要

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Effect of the fluctuation of the potential in the air due to that of charges generated in thunderclouds on the probability distribution of the initiation time of the cloud-to-ground lightning has been numerically examined with a discharge circuit model. It was estimated that the most probable initiation time for the cloud-to-ground lightning was about 5 min for the amplitude A=2×10^<-3> of the fluctuation and about 30 min for A=2×10^<-3> counting from the beginning of the charge production. For A≤5×10^<-4>, the probability distribution of the lightning could be approximated well by a formula [numerical formula], t_<max>: the most probable initiation time and σ: standard deviation) mentioned by Uman as an approximation for the probability distribution of the time interval between strokes (M. A. Uman, The lightning discharge, Academic Press Inc. Orland, 335 (1987)). The value of t_<max> decayed exponentially with respect of A, while that of σ increased.
前橋工科大学の論文
2006-03-31