EMP-induced, time-domain grazing solution for an infinite wire over the ground

The EMP-induced, time-domain current waveform is obtained for an infinite wire over the ground under grazing incidence. In contrast to previous results, the maximum grazing current is found to be slightly larger when the ground conductivity is higher. Also, the grazing angle for maximum current is found to be smaller when the ground conductivity is higher. For a ground conductivity of 1/10 sq S/m, the maximum current is approximately a factor of five larger than typical value reported in the literature. A byproduct of this study is a simple formula of ground inductance for the transmission line mode.