Probability distribution of peak amplitude of lightning electromagnetic field

It requires knowledge of stochastic features of lightning electromagnetic pulse (LEMP) to study effect evaluation of the potentially harmful coupling of LEMP to the electronic systems. Based on statistical characters of lightning currents, LEMP under a general probabilistic framework were discussed, the probability distribution and density functions of peak amplitude of LEMF were deduced. The probability distributions, cumulative probability distributions, means and standard deviations of peak electric field intensity and peak magnetic field intensity at different positions were calculated using multiple-integral method, and the results agree well with the ones obtained by Monte Carlo simulation．