The Mechanism Research of Photoionization Accelerate the Rate of Lightning Current Increase in Lightning Pilot

Since the early pilot lightning sparks preionization provide a large number of photons, photoionization need far less energy than that for the impact ionization, ionization rate is very high, therefore, the photoionization effect of photonl plays a great role in promoting the increase rate of lightning current speed. From the aspect of photoionization in the gas discharge, this paper listed charge density equation, established mathematical model, and simulated the charge density changes of a lightning discharge, and finally drew a conclusion that the maximum current steepness appears after a period of time before the peak rather than in the beginning.