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Statistical Analysis of Lightning Electric Field Measured under Malaysian Condition
Behnam Salimi,Kamyar Mehranzamir,Zulkurnain Abdul-Malek 한국기상학회 2014 Asia-Pacific Journal of Atmospheric Sciences Vol.50 No.2
Lightning is an electrical discharge during thunderstormsthat can be either within clouds (Inter-Cloud), or between clouds andground (Cloud-Ground). The Lightning characteristics and their statisticalinformation are the foundation for the design of lightningprotection system as well as for the calculation of lightning radiatedfields. Nowadays, there are various techniques to detect lightningsignals and to determine various parameters produced by a lightningflash. Each technique provides its own claimed performances. In thispaper, the characteristics of captured broadband electric fields generatedby cloud-to-ground lightning discharges in South of Malaysiaare analyzed. A total of 130 cloud-to-ground lightning flashes from 3separate thunderstorm events (each event lasts for about 4-5 hours)were examined. Statistical analyses of the following signal parameterswere presented: preliminary breakdown pulse train time duration, timeinterval between preliminary breakdowns and return stroke, multiplicityof stroke, and percentages of single stroke only. The BIL modelis also introduced to characterize the lightning signature patterns. Observations on the statistical analyses show that about 79% of lightningsignals fit well with the BIL model. The maximum and minimumof preliminary breakdown time duration of the observed lightningsignals are 84 ms and 560 us, respectively. The findings of the statisticalresults show that 7.6% of the flashes were single stroke flashes,and the maximum number of strokes recorded was 14 multiple strokesper flash. A preliminary breakdown signature in more than 95% of theflashes can be identified.