Abstract:

Based on the monitoring data of lightning location system in Chongqing from 1999 to 2008,the spatialtemporal distribution and variation characteristics of lightning frequency,lighting current amplitude,lightning days and other lightning parameters which reflect lightning activity patterns are mainly analyzed with the mathematical statistics,regression analysis,trend analysis and other methods.The results show that the lightning activity frequency has remarkable seasonal and diurnal variation.54%~80% of seasonal changes concentrate in the summer and diurnal variations mainly concentrate in two time interval of 16〖DK〗∶00～18〖DK〗∶00 and 0〖DK〗∶00～2〖DK〗∶00.Both of lightning frequency and lightning days are higher in west area of Chongqing(the lower one is in the middle and southeast area,and the lowest one is in the northeast area).The lightning current intensity of positive lighting is obvious higher than that of negative lightning,and the positive lightning proportion and average lightning current intensity are both significant higher every month in winter than that in other seasons.The cumulative probability distribution formula of lightning amplitude frequency is obtained based on all above,which offers the theoretical basis to lightning protection and mitigation work