Electromagnetic field estimation using modified transmission line models of lightning strokes

Lightning electromagnetic field and its induced effects in conductive structures, electric circuits and systems can be estimated based on some of the lightning stroke models. Engineering models, such as modified transmission line models, include attenuation factors and channel-base current functions that both determine electromagnetic field components. Electric and magnetic field waveshapes are presented in this paper for new attenuation factors, as well as for modified transmission line model with exponential decay (MTLE) and modified transmission line model with linear current decay with height (MTLL). A comparison to measurement results shows that new attenuation factors provide a good agreement with experiments for both first and subsequent lightning strokes.