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Vertical electric fields and field change parameters due to partly inclined lightning leader channels
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2013 (English)In: Progress In Electromagnetics Research, ISSN 1070-4698, E-ISSN 1559-8985, Vol. 135, 55-80 p.Article in journal (Refereed) Published
Abstract [en]

Vertical electric ¯elds generated by lightning leaderchannels, the total leader ¯eld change and the total leader ¯eld changeto the total return stroke ¯eld change ratio, at a certain distance, weretheoretically analysed by varying the angle of orientation of a segmentof upper part. Ground was treated as a perfectly conducting horizontalplane. Results were able to discern signi¯cantly large di®erences in thestatic ¯eld due to leader channels which have the same total lengthbut a certain channel segment is oriented at di®erent angles. Theoutcome of our calculations consistently explains the scatter of thetotal leader ¯eld observed in previous studies. Without consideringsuch channel segment orientation, one has to assume unrealistic chargesource heights or unreasonable charge densities to calculate matchingvalues for many observed total leader ¯elds and leader ¯eld to returnstroke ¯led ratios, labelled as anomalous observations in the literature.In some cases, irrespective of the charge source height and the chargedensity, one cannot ¯nd a suitable ¯t for the observed ¯elds with thestraight channel model.

Place, publisher, year, edition, pages
2013. Vol. 135, 55-80 p.
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-190553DOI: 10.2528/PIER12081809ISI: 000313890800004OAI: oai:DiVA.org:uu-190553DiVA: diva2:583717
Available from: 2013-01-08 Created: 2013-01-08 Last updated: 2017-12-06Bibliographically approved

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Publisher's full texthttp://www.jpier.org/PIER/pier135/04.12081809.pdf

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Cooray, Vernon

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