Abstract
To calculate the electromagnetic fields generated by return strokes, it is necessary to know the spatial and temporal variation of the return-stroke current along the channel. Unfortunately, only the return-stroke velocity and the current generated at the channel base can be measured directly, and the way in which the return-stroke current varies along the channel must be extracted indirectly. For example, the magnitude of a current and its wave shape at different heights can in principle be extracted by studying the optical radiation. Unfortunately, the exact relationship between the return-stroke-generated optical radiation and the return-stroke current parameters are not known, and therefore only qualitative inferences can be made on the return-stroke current. The information thus obtained indicates that the return-stroke peak current decreases with height while the rise time of the current increases.
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Cooray, V. (2015). The Return Stroke – How to Model It. In: An Introduction to Lightning. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-8938-7_10
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DOI: https://doi.org/10.1007/978-94-017-8938-7_10
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