Abstract

The electrostatic discharge occurs between electrically charged regions may be between the two clouds, or cloud and air, or between a cloud and a ground. This discharge is called lightning discharge [1] - [5]. If there are a sufficiently charges in these regions which produce the high electric potential between them. If the charges in the cloud sufficiently large over the surface of the earth, an equal electric charge of opposite polarity is induced on the earth surface. The greater the accumulation of charges, higher will be the electric field produced. The electric field expression in the form of electro static, induction, and radiation fields were obtained in various papers. These components are very important for the lightning discharge [6] – [16]. There are so many approach used to determine the electric field. In the continuity equation approach, the expression of electric field using scalar and vector potential relates the charge density and current density. To determine an expression for the electric field in terms of current density and charge density is used in this paper.

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