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Propagation effects caused by a rough ocean surface on the electromagnetic fields generated by lightning return strokes
Author(s) -
Ming Ye,
Cooray Ver
Publication year - 1994
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/93rs02085
Subject(s) - lightning (connector) , attenuation , electromagnetic spectrum , rough surface , electromagnetic radiation , radiation , physics , electromagnetic field , surface (topology) , computational physics , geology , acoustics , meteorology , optics , mathematics , materials science , geometry , power (physics) , quantum mechanics , composite material
In this paper we have analyzed the effects of propagation caused by a curved and rough ocean surface on the lightning generated radiation fields. In the analysis the electromagnetic fields and the return stroke spectrum was computed from a return stroke model recently introduced by Cooray [1993]. The results show that for frequencies higher than about 10 MHz the attenuation caused by the rough ocean surface is significant and, in the worst cases, the peak of the derivative of the radiation field can be attenuated by about 35% in propagating 50–100 km distance over a rough ocean surface. Comparison of the calculated spectrum with the experimentally observed spectrum show that some of the features in the measured spectrum can be accounted for by the propagation effects.