There are few corona discharges within about 2 s earlier than the intracloud flash, however proper after it, quite a few sources of corona discharges are detected, and so they develop larger than these before the intracloud flash. It seems that the intracloud flash is capable of producing a burst of corona discharges. Figure 11 exhibits the relationship between source numbers of corona discharges 2 s earlier than and a pair of s after lightning flashes inside 5 km of the windmill. Cases with the source number of zero usually are not plotted in the determine. We can see that for many instances, the source variety of corona discharges after a flash is larger than that earlier than a flash.