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Characteristics of leader pulses in positive ground flashes in Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. Univ Teknol Mara, Ctr Elect Power Engn Studies, Fac Elect Engn, Shah Alam 40450, Selangor, Malaysia..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
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2017 (English)In: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 153, no SI, p. 3-9Article in journal (Refereed) Published
Abstract [en]

This paper presents the characteristics of the electric field pulses observed during leader propagation in positive ground flashes. We analysed in detail the electric field changes occurring just before the first return stroke in 51 positive ground flashes during 2014 summer thunderstorms in Uppsala, Sweden. Pronounced leader pulses (having the same polarity as the return stroke) were observed in 22% of the cases. They were observed to occur within 1.4ms before the first return stroke. Interpulse duration ranged from 13.3 to 50.3 mu s with a mean value of 24.7 mu s The peak amplitude of the leader pulses relative to the return stroke peak ranged from 2.7 to 17.8%. The presence of these pulses shows that the leaders propagate in a stepped manner. Based on the leader pulses' time of initiation and average speed of the leader, the distance travelled by the leader was also estimated. One case of positive ground flash preceded by opposite polarity leader pulses just before the return stroke is also reported. To the best of our knowledge, this is the first time that such a case in positive ground flashes is reported. We suggest that these opposite polarity leader pulses are due to the negatively-charged leader branch of a bi-directional leader inside the cloud that propagates towards observation point.

Place, publisher, year, edition, pages
2017. Vol. 153, no SI, p. 3-9
Keywords [en]
Positive ground flash, Positive leader, Negative leader, Stepped-leader, Bi-directional leader, Negatively-charged leader branch
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-340678DOI: 10.1016/j.epsr.2016.11.026ISI: 000413380500002OAI: oai:DiVA.org:uu-340678DiVA, id: diva2:1180171
Conference
13th International Symposium on Lightning Protection (SIPDA), SEP 28-OCT 02, 2015, Balneario Camboriu, BRAZIL
Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2018-02-05Bibliographically approved

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Johari, DalinaCooray, VernonRahman, MahbuburHettiarachchi, PasanIsmail, Mohd Muzafar

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