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Title: Activity of cloud-to-ground lightning observed in Sri Lanka and in surrounding area of the Indian Ocean
Authors: Weerasekera, A.B.
Sonnadara, D.U.J.
Fernando, I.M.K.
Liyanage, J.P.
Lelwala, R.
Ariyaratne, T.R.
Keywords: Indian Ocean
Issue Date: 2001
Citation: Sri Lankan Journal of Physics, 2 (2001) 21-30
Abstract: Activity of cloud-to-ground lightning flashes observed during the monsoon thunderstorms over Sri Lanka with a lightning locating system consisting of two direction finders (DF) is presented. The Northeast monsoon produced over 884 cloud-to-ground flashes with a peak lightning rate of 96 flashes per hour whereas Southwest monsoon produced 3,294 flashes with a peak rate of 104 flashes per hour. A relative flash density maximum of 198 flashes per 2828 km2 was observed over Ratnapura area (6.68N, 80.40E). The percentage of positive flashes and average peak lightning current values for negative flashes are found to be 6.4% and 36 kA respectively for the Northeast monsoon period and 1.7% and 40 kA respectively for the Southwest monsoon period for the flashes that struck within 10-250 km range. No significant difference in average peak lightning current values were observed for the negative and positive flashes in both monsoons.
Appears in Collections:Department of Physics

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