Investigation of narrow bipolar pulse lightning under influence of southwest monsoon season

Yap, Zhi Xin (2020) Investigation of narrow bipolar pulse lightning under influence of southwest monsoon season. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This final year project is aimed to investigate one of unique type of lightning inside the cloud which is known as narrow bipolar pulse. Mostly, based on the reports by many lightning investigators found that the characteristic of the lightning activity was related to the changes of meteorology condition which can be due to latitude, season, gepgrapical region and type of the storm. However most of the reports were speculation without attempting the real scientific features. Until recently, there is no report of lightning activity in Malaysia to relate with physical changes. Therefore, in this final year project, the author put an effort to study the relationship of narrow bipolar pulse with monsson season since it was noticed that the climate change with regard to the thunderstorm activity in Malaysia mostly under influence to monsoon season. This project only focusing on southwest monsoon season and transition period to EWS. This project implementing wavestudio under Lecroy Product. The narow bipolsr pulse lightning are recorded using LeCroy 4160 then followed by the analysis work using the wavestudio.Briefly explain the number of total data, number of isolated NBP, number of NBP associated with cloud to ground flash with parameter of duration, peak amplitude, zero crossing time, rising time 0-100%, rising time 10%-90%, full width half motion, overshoot and ratio. Based on analysis result, it was found that the average peak amplitude is -0.48V, average duration is 27.29ms, average zero crossing time 5.32ms, average rising time 0-100% is 2.62ms, average rising time 10%-90% is 1.56ms, average full width half motion is 0.14ms, average overshoot is 2.13V and average ratio is 5.50.

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