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Expressions for far electric fields produced at an arbitrary altitude by lightning return strokes
Uppsala University. (EMC)ORCID iD: 0000-0002-1607-2493
University of Florida, Gainesville, USA.
Uppsala University.
2007 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 112, no D16Article in journal (Refereed) Published
Abstract [en]

[1] Electromagnetic fields produced at high altitudes by return strokes in cloud-to-ground lightning are needed in studies of transient luminous events in the mesosphere. Such calculations require the use of a lightning return stroke model. Two of the widely used return stroke models are ( 1) the modified transmission line model with exponential decay (MTLE) of current with height and ( 2) the modified transmission line model with linear decay (MTLL) of current with height. In this paper, simplified expressions based on the MTLE and MTLL models are derived for calculating far ( radiation) electric fields produced at an arbitrary elevation angle by lightning return strokes. It is shown that different (for example, containing either spatial or time integral), but equivalent equations can be derived for each of the models. Predictions of simplified expressions are compared with electric fields computed using exact expressions, including all the field components, and the validity of simplified expressions for distances that are much greater than the radiating channel length is confirmed.

Place, publisher, year, edition, pages
2007. Vol. 112, no D16
National Category
Engineering and Technology Earth and Related Environmental Sciences
URN: urn:nbn:se:kth:diva-62554DOI: 10.1029/2007JD008559ISI: 000248897800003OAI: diva2:480824
QC 20120120Available from: 2012-01-20 Created: 2012-01-19 Last updated: 2012-01-20Bibliographically approved

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Thottappillil, Rajeev
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