Novel model for the simulation of lightning stepped leader

The stepped leader forms the first phase of the first stroke in any lightni ng flash. It is basically a stepwise elongating discharge in air, which car ries significant charge. The charge distribution on the leader and its velo city of descent determine the attractive radius in shielding efficiency cal culations. Also, the conductivity and the charge distribution on the leader tip region govern the initial stages of the return stroke. Therefore, ther e is a need for determining these parameters accurately. In this regard, a self-consistent model for the stepped leader will be very useful. The autho rs present a new model for the stepped leader that does not assume basic qu antities like leader charge, current and velocity, but derives them from th e computer simulation.