The Characterization Of Negative Cloud-To-Ground Lightning Flashes In Malaysia Under The Influence Of Pollution

Muhammad Ridwan, Muhamad (2015) The Characterization Of Negative Cloud-To-Ground Lightning Flashes In Malaysia Under The Influence Of Pollution. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) The Characterization Of Negative Cloud-To-Ground Lightning Flashes In Malaysia Under The Influence Of Pollution 24 Pages.pdf Download (76kB)

Abstract

Lightning is one of the unpredictable natural phenomenon. Study on lightning is very important because engineers must know lightning characteristics before designing lightning protection systems. This study is focused more on return stroke which occurs in negative cloud-to-ground lightning flash. The characteristics of the negative cloud-toground lightning flashes in Malaysia are studied by analyzing electric field generated by the whole flash in nanoseconds resolution. Six out of fifty successive negative cloud-toground lightning flashes were selected as sample and analyzed. The measurement was recorded in Universiti Teknikal Malaysia Melaka (UTeM) during southwest monsoon period which is from April to May 2015. It was found that, total number of interstroke intervals has an arithmetic mean value of 76.38ms, a geometric mean value of 4.32ms and does not depend on return stroke order. Of the six negative cloud-to-ground lightning flashes, 83.3% have multiple strokes. In addition, the minimum and maximum peak amplitude of first return stroke (RS) are 0.33 and 1.22V respectively. The mean and geometric mean of peak amplitude for first return stroke (RS) that have been recorded were 0.79 and 0.73V. The percentage of single-stroke flashes was 16.7%, while the mean numbers of strokes per flash and maximum number of stroke per flash were 3 and 5, respectively.

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