Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia

Lightning generates electric fields that propagate through the vicinity of the atmosphere that have negative consequences especially to power, electronic and communications systems. Knowledge to the types of lightning and their characteristics must be acquired to fulfil the task of mitigating lightn...

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Main Author:	Hamzah, Muhammad Noh
Format:	Thesis
Language:	English
Published:	2015
Subjects:	Lightning Atmospheric electricity
Online Access:	http://psasir.upm.edu.my/id/eprint/56237/1/FK%202015%2050RR.pdf
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id	my-upm-ir.56237
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spelling	my-upm-ir.562372017-06-30T03:47:46Z Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia 2015-06 Hamzah, Muhammad Noh Lightning generates electric fields that propagate through the vicinity of the atmosphere that have negative consequences especially to power, electronic and communications systems. Knowledge to the types of lightning and their characteristics must be acquired to fulfil the task of mitigating lightning problems. Most studies regarding the topic were done in temperate and sub-tropic regions. Thus, this study seeks to uncover better understanding of the lightning generated electric fields of cloud-to-ground lightning flashes observed in Malaysia in the tropics. Measurements of the generated fields were done using parallel plate antenna coupled with a recording system during the months of May, June and October 2013 at the premises of Universiti Putra Malaysia. The measurement site has a geographical coordinate of 2°59'19.9"N latitude and 101°43'29.8"E longitude, situated in Serdang, Selangor area. Malaysia generally has a tropical climate with maximum monsoon rain occurring from October due to southwest monsoon and intermonsoon period which affects the Selangor. The locations of some of the flashes were obtained from the Tenaga Nasional Berhad Research which is a research centre for the largest local power utility company, Tenaga Nasional Berhad using their Fault Analysis and Lightning Location System. This thesis presents the characteristics of lightning generated vertical electric field waveforms recorded in Malaysia. A total of 115 negative lightning and 57 positive lightning found with preliminary breakdown pulses, return strokes and chaotic pulse trains were present and analysed. The main findings of this study include characteristics of preliminary breakdown pulses, unusually long duration return strokes lasting more than 1 ms per stroke, occurrence of positive lightning and chaotic pulse trains in Malaysia with average durations of 335.12 μs for both negative and positive lightning combined, high multiplicity of positive lightning return strokes having an average multiplicity of 3.86, short interstroke intervals of positive lightning with an arithmetic mean of 25.03 ms, occurrence of chaotic pulse trains in positive lightning and unusual occurrences of chaotic pulse trains in terms of their placement in both types of lightning. In conclusion, the findings of the electric field generated in Malaysia were found to be distinct in many ways that adds to new knowledge from the findings previously mentioned. This is important as the kind of lightning activity affects the way in which protection systems are made. Lightning Atmospheric electricity 2015-06 Thesis http://psasir.upm.edu.my/id/eprint/56237/ http://psasir.upm.edu.my/id/eprint/56237/1/FK%202015%2050RR.pdf application/pdf en public masters Universiti Putra Malaysia Lightning Atmospheric electricity
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Lightning Atmospheric electricity
spellingShingle	Lightning Atmospheric electricity Hamzah, Muhammad Noh Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia
description	Lightning generates electric fields that propagate through the vicinity of the atmosphere that have negative consequences especially to power, electronic and communications systems. Knowledge to the types of lightning and their characteristics must be acquired to fulfil the task of mitigating lightning problems. Most studies regarding the topic were done in temperate and sub-tropic regions. Thus, this study seeks to uncover better understanding of the lightning generated electric fields of cloud-to-ground lightning flashes observed in Malaysia in the tropics. Measurements of the generated fields were done using parallel plate antenna coupled with a recording system during the months of May, June and October 2013 at the premises of Universiti Putra Malaysia. The measurement site has a geographical coordinate of 2°59'19.9"N latitude and 101°43'29.8"E longitude, situated in Serdang, Selangor area. Malaysia generally has a tropical climate with maximum monsoon rain occurring from October due to southwest monsoon and intermonsoon period which affects the Selangor. The locations of some of the flashes were obtained from the Tenaga Nasional Berhad Research which is a research centre for the largest local power utility company, Tenaga Nasional Berhad using their Fault Analysis and Lightning Location System. This thesis presents the characteristics of lightning generated vertical electric field waveforms recorded in Malaysia. A total of 115 negative lightning and 57 positive lightning found with preliminary breakdown pulses, return strokes and chaotic pulse trains were present and analysed. The main findings of this study include characteristics of preliminary breakdown pulses, unusually long duration return strokes lasting more than 1 ms per stroke, occurrence of positive lightning and chaotic pulse trains in Malaysia with average durations of 335.12 μs for both negative and positive lightning combined, high multiplicity of positive lightning return strokes having an average multiplicity of 3.86, short interstroke intervals of positive lightning with an arithmetic mean of 25.03 ms, occurrence of chaotic pulse trains in positive lightning and unusual occurrences of chaotic pulse trains in terms of their placement in both types of lightning. In conclusion, the findings of the electric field generated in Malaysia were found to be distinct in many ways that adds to new knowledge from the findings previously mentioned. This is important as the kind of lightning activity affects the way in which protection systems are made.
format	Thesis
qualification_level	Master's degree
author	Hamzah, Muhammad Noh
author_facet	Hamzah, Muhammad Noh
author_sort	Hamzah, Muhammad Noh
title	Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia
title_short	Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia
title_full	Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia
title_fullStr	Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia
title_full_unstemmed	Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia
title_sort	distinct characteristics of cloud-to-ground lightning electric fields generated in malaysia
granting_institution	Universiti Putra Malaysia
publishDate	2015
url	http://psasir.upm.edu.my/id/eprint/56237/1/FK%202015%2050RR.pdf
_version_	1747812128943767552

Distinct characteristics of cloud-to-ground lightning electric fields generated in Malaysia

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