A field-based inverse algorithm for the identification of different height lightning return strokes

An identification procedure for lightning return strokes is proposed It makes it possible to reconstruct the return stroke height-dependent attenuation function making use only of the measured vertical component of the electric field radiated by the lightning channel and it can be performed without any information about the channel base current, the measurement of which is generally very difficult and noisy. It is also shown that the method with suitable modifications, can also be employed for the mathematical evaluation of the lightning channel height, which is a physical quantity a priori unknown. The approach has been validated by means of the numerical simulation of classical TL MTLL and MTLE engineering models for a wide class of return strokes, with height ranging in the interval 15-30km.