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Some characteristics of leader pulses in positive cloud-to-ground flashes
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. Univ Teknol MARA, Shah Alam, Malaysia. (Åskforskning)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Åskforskning)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Åskforskning)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Åskforskning)
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2015 (English)In: 2015 International Symposium On Lightning Protection (Xiii SIPDA), 2015, 283-287 p.Conference paper, Published paper (Refereed)
Abstract [en]

Compared to negative ground flashes, not much is known about the characteristics of leaders in positive ground flashes. This paper presents some characteristics of the electric field pulses observed during leader propagation in positive ground flashes. We analyzed in detail the electric field changes produced by 50 positive ground flashes during 2014 summer thunderstorms in Uppsala, Sweden. Pronounced leader pulses were observed in 22% of the cases. They were observed to occur 1.4 ms or less before the first return stroke. Interpulse duration ranged from 13.3-50.3 mu s with a mean value of 24.7 mu s. The largest relative amplitude ranged from 2.7-17.8 % of the return stroke peak. No dependence of the pulses occurrence were observed with distance. However, the relative amplitude were found to decrease with distance. The presence of these pulses suggests that the leaders propagate in a stepped manner. One case of positive ground flashes preceded by negative polarity pulses just before the return stroke is also reported.

Place, publisher, year, edition, pages
2015. 283-287 p.
Keyword [en]
positive ground flash; positive leader; stepped-leader
National Category
Meteorology and Atmospheric Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Atmospheric Discharges
Identifiers
URN: urn:nbn:se:uu:diva-286607DOI: 10.1109/SIPDA.2015.7339281ISI: 000382966700050ISBN: 9781479987542 (print)OAI: oai:DiVA.org:uu-286607DiVA: diva2:921819
Conference
2015 International Symposium on Lightning Protection (XIII SIPDA)
Available from: 2016-04-21 Created: 2016-04-21 Last updated: 2016-10-28Bibliographically approved

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Johari, DalinaCooray, VernonHettiarachchi, PasanRahman, MahbuburIsmail, Mohd Muzafar

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