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On the electric field at the tip of dart leaders in lightning flashes
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.
2009 (English)In: Journal of Atmospheric and Solar-Terrestrial Physics, ISSN 1364-6826, E-ISSN 1879-1824, Vol. 71, no 12, 1397-1404 p.Article in journal (Refereed) Published
Abstract [en]

The results obtained in this study show that as the dart leader tip passes a given point on the defunct return stroke channel the electric field increases within a fraction of a microsecond to values larger than the critical electric field necessary for the initiation of cold electron runaway in low-density air comprising the channel. These results are in support of the hypothesis that cold runaway electron breakdown may play a role in the emission of X-ray bursts by dart leaders. The calculations also show that the peak power dissipated by a typical dart leader is about 300-500 MW/m and the energy dissipated within the first 10 [mu]s or so is about 500-600 J/m. Furthermore, the minimum resistance and the maximum radius of the core of a typical dart leader are estimated to be about 3 [Omega]/m and 0.003 m, respectively.

Place, publisher, year, edition, pages
2009. Vol. 71, no 12, 1397-1404 p.
Keyword [en]
Lightning, Energy, Electric field, Dart leaders, Electrical discharges, X-rays
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-113140DOI: 10.1016/j.jastp.2009.06.002ISI: 000268905500021ISBN: 1364-6826 (print)OAI: oai:DiVA.org:uu-113140DiVA: diva2:289909
Available from: 2010-01-25 Created: 2010-01-25 Last updated: 2017-12-12Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/B6VHB-4WGMBC5-2/2/e3ad163be11a7d9bc80f59675b7658d1

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Cooray, Vernon

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