Radiation Fields of the Multiple Return Stroke Lightning

Abstract

Considering double exponential expressions of velocity and current for multiple return stroke of lightning, expressions for the radiation fields and its phase angles have been derived and values calculated. The radiation field peaks at 5 KHz. An increase has been found in the field strength with increasing order of the strokes. Also the frequency of peak decreases slightly with increasing order of strokes. The phase of omission of radiation field at first decreases and then increases, the minimum being at 5 KHz. As frequency increases, the difference of phase at a given frequency between two order of strokes increases slightly. The calculated increase of field strength with order of the strokes have been compared with theoretical and experimental observation of various workers. These values are found in good agreement.

Indexing Terms:

• Lightning
• Radiation Fields