Acoustic study of winter thunder : For analysis on lightning discharge path from the acoustic thunder signal

摘要

Winter lightning in Hokuriku area called one shot lightning has different features from summer lightning. The thundercloud in winter is very low in its height and very wide in extend area and it has very large energy in comparison with that of the summer one. The object of this study is to examine the position and its extent area from acoustic thunder sound and is also to know numbers of branches within lightning discharge from the wave from of the acoustic signal. Two simple models for total discharge area and for the discharge detail figures are presented. The measured signal of thunder is compared with the results from the simple model.