ABSTRACT
The process of ionization preceding the occurrence of lightning surge is basically intensive cycles accompanied by a powerful electric field, where both electrons and positive ions and their clusters take cumulative roles in ionization that will eventually release the electron and positive ion avalanche. Due to the huge complexity surrounding the process of cumulative ionization preceding the release of the conductive and convective surges, the role of atmospheric pressure and temperature on lightning phenomenon in air could be shown using the approximate criterion developed by Townsend. Consider first the case for the inducing and induced fields based on the concept of the magnetic vector potential and constant current density in return strokes. Analyses regarding the release of charge carriers due to induced and inducing fields have been based on the magnetic vector potential obtained through the procedure of summation of magnetic moments.
