Influence of geometry of — GC strokes on associated electromagnetic waveforms

Abstract

GC (Ground to Cloud) strokes are specifically observed in winter along the coast of the Sea of Japan, characterized by high range-normalized amplitudes and bipolar waveforms in their electromagnetic radiation. The strokes cause severe transmission line faults, but their modeling, which is necessary to estimate current parameters from electromagnetic radiation, has not been reached to agreement yet. In this paper, relationship between the geometry of lightning channels and electric field waveforms of negative GC strokes are investigated, and estimation of the peak current and location error are discussed.