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Reconstruction of lightning channel geometry by localizing thunder sources
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2013 (English)In: Journal of Atmospheric and Solar-Terrestrial Physics, ISSN 1364-6826, Vol. 102, 81-90 p.Article in journal (Refereed) Published
Abstract [en]

Thunder is generated as a result of a shock wave created by sudden expansion of air in the lightning channel due to high temperature variations. Even though the highest amplitudes of thunder signatures are generated at the return stroke stage, thunder signals generated at other events such as preliminary breakdown pulses also can be of amplitudes which are large enough to record using a sensitive system. In this study, it was attempted to reconstruct the lightning channel geometry of cloud and ground flashes by locating the temporal and spatial variations of thunder sources. Six lightning flashes were reconstructed using the recorded thunder signatures. Possible effects due to atmospheric conditions were neglected. Numerical calculations suggest that the time resolution of the recorded signal and 10 ms(-1)error in speed of sound leads to 2% and 3% errors, respectively, in the calculated coordinates. Reconstructed channel geometries for cloud and ground flashes agreed with the visual observations. Results suggest that the lightning channel can be successfully reconstructed using this technique.

Place, publisher, year, edition, pages
2013. Vol. 102, 81-90 p.
Keyword [en]
Thunder, Localization, Lightning, Channel geometry
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
URN: urn:nbn:se:uu:diva-208653DOI: 10.1016/j.jastp.2013.04.013ISI: 000324014100010OAI: oai:DiVA.org:uu-208653DiVA: diva2:654005
Available from: 2013-10-07 Created: 2013-10-07 Last updated: 2014-01-10Bibliographically approved

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