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On the electromagnetic fields, Poynting vector, and peak power radiated by lightning return strokesThe initial radiation fields, Poynting vector, and total electromagnetic power that a vertical return stroke radiates into the upper half space have been computed when the speed of the stroke, nu, is a significant fraction of the speed of light, c, assuming that at large distances and early times the source is an infinitesimal dipole. The initial current is also assumed to satisfy the transmission-line model with a constant nu and to be perpendicular to an infinite, perfectly conducting ground. The effect of a large nu is to increase the radiation fields by a factor of (1-beta-sq cos-sq theta) exp -1, where beta = nu/c and theta is measured from the vertical, and the Poynting vector by a factor of (1-beta-sq cos-sq theta) exp -2.
Document ID
19930030068
Document Type
Reprint (Version printed in journal)
Authors
Krider, E. P. (Arizona Univ. Tucson, United States)
Date Acquired
August 15, 2013
Publication Date
October 20, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D14
ISSN: 0148-0227
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: NAG10-0092
Distribution Limits
Public
Copyright
Other