Title :
On the Accuracy of Several Approximate Theories Used in Quantifying the Propagation Effects on Lightning Generated Electromagnetic Fields
Author_Institution :
EMC Group, Uppsala Univ., Uppsala
fDate :
7/1/2008 12:00:00 AM
Abstract :
The effect of finitely conducting ground on the signature of lightning generated vertical electric fields at ground level was 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 0.001 S/m. The results obtained from the exact theory are compared with the predictions of several approximate theories available in the literature. Based on that comparison the limits of validity of these approximate theories are obtained.
Keywords :
approximation theory; electromagnetic fields; electromagnetic wave propagation; lightning; finitely conducting ground; ground conductivities; lightning generated electromagnetic fields; propagation effects; return strokes; Character generation; Conductivity; Electric variables measurement; Electromagnetic fields; Electromagnetic measurements; Electromagnetic propagation; Frequency domain analysis; Integral equations; Lightning; Optical propagation; Lightning; propagation effects; return strokes;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2008.924680
