Tab. gives a summary lightning discharge characteristics
underneath different polarity in thunderstorms. By analyzing
lightning discharge in 24 thunderstorms, when the surface E
field is positive in thunderstorm, average CG lightning flashes
in every thunderstorm are just 9.2flashes, positive CG
lightning flashes are 5 flashes, account for 54%,mean peak
current is 42.1kA.But when the surface E field is negative in
thunderstorm, average CG lightning flashes in every thunderstorm are 58.7 flashes, positive CG lightning flashes are just 1.4 flashes, mean peak current is 29.9kA.