Various engineering models of return strokes specifying the temporal and special distribution of the currents along the channel have been presented, and these models have been tested for negative subsequent strokes of natural or triggered lightning by comparing measured and model-predicted electric and/or magnetic field waveforms. In this letter, the transmission line model is tested for a negative first stroke of natural lightning by comparing parameters of the magnetic field waveform obtained by LLS with those calculated by using the return-stroke current estimated from the measured electric field.
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