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2018 34th International Conference on Lightning Protection (ICLP)

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Audible Frequency Analysis of Ground Flashes

Thunder signatures categorized into three types based on peak pressure and variation in fundamental frequency, have been studied by using acoustic spectrum of thunder. S-transformation has been 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.

Sidath Abegunawardana
University of Colombo
Sri Lanka

J A P Bodhika
University of Ruhuna
Sri Lanka

Sankha Nanayakkara
University of Colombo
Sri Lanka

Upul Sonnadara
University of Colombo
Sri Lanka

Mahendra Fernando
University of Colombo
Sri Lanka

Vernon Cooray
Uppsala University
Sweden

 


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