An improvement of modified transmission line models of lightning strokes

Some suitable lightning current attenuation factors are presented in the paper and used within modified transmission line models of lightning strokes for the computation of lightning electromagnetic field. In comparison to other models results at various distances from lightning discharges, these factors provide electric and magnetic field waveshapes closer to experimentally obtained. Compared to the linear and exponential decaying as in some models, here proposed factors assume that the lightning current is more attenuated closer to the channel base and to the channel top, but lesser at about the half of the channel height. Although lightning discharges differ much from each other, a lightning stroke model is considered suitable if it results in some of the noticed characteristics in measured electromagnetic field at certain distances from the lightning strike point.