On the transmission line model for lightning return stroke representation

The widely used transmission‐line (TL) model of lightning return stroke in a vertical channel is most rigorously represented by a vertical phased array of current sources that produce a spherical transverse electromagnetic (TEM) wave in the case of return‐stroke speed v equal to the speed of light c...

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Bibliographic Details
Published in:Geophysical research letters 2003-12, Vol.30 (24), p.ASC13.1-n/a
Main Authors: Baba, Y., Rakov, V. A.
Format: Article
Language:English
Subjects:
Earth, ocean, space
Exact sciences and technology
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Summary:The widely used transmission‐line (TL) model of lightning return stroke in a vertical channel is most rigorously represented by a vertical phased array of current sources that produce a spherical transverse electromagnetic (TEM) wave in the case of return‐stroke speed v equal to the speed of light c. If the radius of the lightning channel were equal to zero, the equivalent representation could be obtained by applying a hypothetical infinitesimal source of pure spherical TEM wave at the bottom of the channel. A non‐zero‐radius vertical wire above ground excited by a practical source at its bottom end cannot support unattenuated current waves, and the associated electromagnetic field structure is non‐TEM.
ISSN:0094-8276
1944-8007
DOI:10.1029/2003GL018407