Derivation of return stroke parameters from the electric and magnetic field derivatives
- University of Uppsala (Sweden)
Recently, the transmission line model of the return stroke (Uman and McLain, 1970) has been used by several researchers to infer the characteristics of lightning return strokes. Equations are based on three assumptions: (a) the fields are pure radiation, (b) the maximum return stroke height at time t is much less than the distance to the point of observation, and (c) the ground is perfectly conducting. Any deviation from these assumptions will lead to an error in the inferred properties of the return stroke such as return stroke velocity and return stroke peak current derivative. In this paper the author calculates the electric and magnetic field derivatives from lightning return strokes at different distances over both perfectly conducting and finitely conducting ground, by using the transmission line model. The results will then be compared with those obtained from equations to investigate how far the electric and magnetic field peak derivatives deviate from those given by these equations in the presence of near field components and when the fields have propagated over finitely conducting earth.
- OSTI ID:
- 5595891
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (USA), Vol. 16:1; ISSN 0094-8276
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
LIGHTNING
ELECTRIC FIELDS
MAGNETIC FIELDS
CALCULATION METHODS
COMPARATIVE EVALUATIONS
ELECTRIC CONDUCTIVITY
ELECTRIC GROUNDS
EQUATIONS
MATHEMATICAL MODELS
POWER TRANSMISSION LINES
ELECTRIC DISCHARGES
ELECTRICAL PROPERTIES
PHYSICAL PROPERTIES
640200* - Atmospheric Physics