Abstract
This paper examines the influence of the lightning channel geometry, and the variation of the linear charge density with height, in a model for the first return stroke. The tortuous geometry of the discharge channel is simulated by means of statistical characterizations of natural lightning reported in the literature. The linear charge density for a channel with a tortuous geometry is modeled by means of a regression analysis of simulated data. Finally, the results presented, show a comparison between the spatio-temporal distribution of currents along a straight and vertical channel with those of a tortuous channel with non-homogeneous linear charge density.
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