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Electromagnetic fields radiated from a lightning return stroke - Application of an exact solution to Maxwell's equationsA solution is presented for the electromagnetic fields radiated by an arbitrarily oriented current filament over a conducting ground plane in the case where the current propagates along the filament at the speed of light, and this solution is interpreted in terms of radiation from lightning return strokes. The solution is exact in the fullest sense; no mathematical approximations are made, and the governing differential equations and boundary conditions are satisfied. The solution has the additional attribute of being specified in closed form in terms of elementary functions. This solution is discussed from the point of view of deducing lightning current wave forms from measurements of the electromagnetic fields and understanding the effects of channel tortuosity on the radiated fields. In addition, it is compared with two approximate solutions, the traditional moment approximation and the Fraunhofer approximation, and a set of criteria describing their applicability are presented and interpreted.
Document ID
19780053485
Document Type
Reprint (Version printed in journal)
Authors
Le Vine, D. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meneghini, R. (NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
May 20, 1978
Publication Information
Publication: Journal of Geophysical Research
Volume: 83
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other