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Atmosphere 2015, 6(12), 1904-1925; doi:10.3390/atmos6121837

Electric Field Signatures in Wideband, 3 MHz and 30 MHz of Negative Ground Flashes Pertinent to Swedish Thunderstorms

1
Ångström Laboratory, Division of Electricity, Department of Engineering Sciences, Uppsala University, Box 534, SE-75121, Sweden
2
Faculty of Electronics and Computer Engineering, Telecommunication Engineering Department, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal, Malacca 76100, Malaysia
3
Department of Physics, Amrit Science College, Tribhuvan University, Lainchaur, Kathmandu 001, Nepal
4
Faculty of Electrical Engineering, Centre for Power Electrical Engineering Studies, Universiti Teknologi Mara, Shah Alam, Selangor 40450, Malaysia
*
Authors to whom correspondence should be addressed.
Academic Editor: Farhad Rachidi
Received: 11 August 2015 / Revised: 1 December 2015 / Accepted: 4 December 2015 / Published: 15 December 2015
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Abstract

In this study, the electric field signatures of negative ground flashes pertinent to the Swedish thunderstorms were recorded simultaneously during the summer of 2014 using wide (up to 100 MHz) and narrow (at 3 MHz and 30 MHz as central frequencies) bandwidth antenna systems. The electric field signatures were recorded for a time duration of 250 ms. In the analysis, the whole flash was considered and a total of 98 flashes were chosen where electric field signatures of all wideband, 3 MHz and 30 MHz signals were present. It is observed that preliminary breakdown pulses are stronger radiators at 3 and 30 MHz compared to the return strokes. A comparison of our results with those of the previous studies obtained from different geographical regions clearly shows that the strength of preliminary breakdown pulses is higher in the temperate region (Sweden for instance) and is a function of latitude. View Full-Text
Keywords: lightning; negative ground flashes; 3 MHz and 30 MHz radiations lightning; negative ground flashes; 3 MHz and 30 MHz radiations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ismail, M.M.; Rahman, M.; Cooray, V.; Sharma, S.; Hettiarachchi, P.; Johari, D. Electric Field Signatures in Wideband, 3 MHz and 30 MHz of Negative Ground Flashes Pertinent to Swedish Thunderstorms. Atmosphere 2015, 6, 1904-1925.

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