Title :
Calculation methods of electromagnetic fields very close to lightning
Author :
Yang, Chunshan ; Zhou, Bihua
Author_Institution :
EMP Lab., Nanjing Eng. Instn., China
Abstract :
In this short paper, we present two methods: Quasi-images formula and finite-difference time-domain (FDTD) method to evaluate the electromagnetic fields very close to lightning channel, which are applicable for poorly conducting ground case, and the numerical results are consistent with each other. Moreover, the vertical electric fields at 15 m obtained by the two proposed methods is in good agreement with the measured result, and the horizontal electric field at a distance of 100 m above finely conducting ground obtained by the FDTD method is identical to the field obtained by accurate Cooray-Rubinstein approximation. With the proposed quasi-images formula, the effects of electrical dispersion of the ground on the lightning generated electromagnetic fields are analyzed and some significant results are obtained.
Keywords :
approximation theory; conducting bodies; electric fields; electromagnetic fields; electromagnetic pulse; finite difference time-domain analysis; lightning; 100 m; 15 m; Cooray-Rubinstein approximation; electrical dispersion effects; finely conducting ground; finite-difference time-domain method; horizontal electric fields; lightning channel; lightning electromagnetic pulse; lightning generated electromagnetic fields; poorly conducting ground; quasiimages formula; vertical electric fields; Conductivity; Dispersion; Distributed power generation; EMP radiation effects; Electromagnetic fields; Electromagnetic measurements; Finite difference methods; Integral equations; Lightning; Time domain analysis;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
DOI :
10.1109/TEMC.2004.823626