A Comparison of Different Engineering Models for Computation of Lightning Magnetic Field of Negative First Strokes

A comparison of different engineering models results for a lightning magnetic field of negative first strokes is presented in this paper. A new function for representing double-peaked channel-base current is used for lightning stroke modeling. This function includes the initial and subsidiary peak in a current waveform. For experimentally measured currents, a magnetic field is calculated for the three engineering models: transmission line (TL) model, TL model with linear decay (MTLL), and TL model with exponential decay (MTLE).