期刊
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
卷 51, 期 3, 页码 526-531出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEMC.2009.2019759
关键词
Attenuation; finite ground conductivity; lightning; magnetic field; propagation effects; radiation field; return stroke
The effects of finitely conducting ground on the signature of lightning-generated magnetic fields at ground level were evaluated by numerical solution of Sommerfeld's integrals. Results are presented for distances between 10 m to 1 km from the lightning channel and for ground conductivities in the range of 0.01 and 0.0001 S/m. The results obtained from the exact theory are compared with the predictions of two frequently used analytical approximations to Sommerfeld's equations. Based on that comparison, the limits of validity of these approximate theories are obtained.
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