Abstract:
Abstract—Thunder signatures have been categorized into
three types using recorded peak pressure. The variation in
fundamental frequency initiated by ground flashes has been
studied by using an acoustic spectrum of thunder. Stransformation has used to estimate the dominant frequency
variation around the peak pressure. The mean fundamental
frequencies of type 3 ground and cloud flashes are 160 Hz and
98 Hz respectively. The mean frequencies of type 2 ground and
cloud flashes are 108 Hz and 82 Hz respectively. The mean
fundamental frequencies of type 1 ground and cloud flashes
are 88 Hz and 123 Hz respectively.
