Propagation effects caused by a rough ocean surface on the electromagnetic fields generated by lightning return strokes
Propagation effects caused by a rough ocean surface on the electromagnetic fields generated by lightning return strokes
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DOI：
10.1029/93rs02085
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发表时间：
1994
期刊：
影响因子：
1.6
通讯作者：
Ye Ming;V. Cooray
中科院分区：
文献类型：
--
作者：
Ye Ming;V. Cooray
在本文中，我们分析了弯曲且粗糙的海洋表面引起的传播对闪电产生的辐射场的影响。在分析中，电磁场和回程频谱是根据 Cooray [1993] 最近引入的回程模型计算的。结果表明，对于高于约10 MHz的频率，粗糙海洋表面引起的衰减非常显着，在最坏的情况下，在粗糙海洋表面传播50-100 km距离时，辐射场导数峰值可衰减约35%。计算光谱与实验观察光谱的比较表明，测量光谱中的一些特征可以通过传播效应来解释。
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.