The Realistic Approximation on Equivalent Attractive Radius of Lightning Strikes

During the past few decades, the equivalent attractive radius (R_ao(h)) of lightning strike has become an improper integral term, which can hardly determine the result when implemented. Therefore, this paper proposes an approximate equation of equivalent attractive radius in a simplified term. This will be investigated through a Generic model (GM) of a vertical conducting rod. Moreover, the result of this equation will be compared focusing on accuracy with the high correctness solution of numerical calculation, such as the midpoint method. As a result, these should be equivalent due to the absolute error of no more than one percent. Furthermore, the result of R_ao(h) through this equation, can be analyzed by the number of strikes per year (Ns), which corresponds with the actual experimental data. Also, the approximate equation in this paper is appropriately utilized to be practical. Finally, correlation of the approximate equation will analyze R_ao(h) and Ns of a tall building, namely the Khema-pirataram temple, to evaluate the risk due to lightning flashes to the top of the structure.