雷击高空物体时自由空间电磁场的计算

Helin Zhou, R. Thottappillil, G. Diendorfer
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引用次数: 1

摘要

我们计算了雷击高空物体在不同仰角和距离下的垂直电场和方位磁场。推导了高物体顶部电流反射系数为零、回波在闪电通道中的传播速度等于光速时电磁场的简单精确表达式。此外,我们还研究了高物体顶部的电流反射系数不为零且传播速度小于光速(如1 / 2)时对电磁场的影响。有趣的是,我们发现垂直电场在最小仰角和最大仰角处都有最大峰值。而对于方位磁场,我们注意到其最大峰值总是在最小仰角或相对较小的仰角处。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calculation of electromagnetic fields in free space when lightning strikes a tall object
We calculate vertical electric field and azimuthal magnetic field at different elevation angles and distances associated with lightning strikes a tall object. Simple and exact expressions for electromagnetic fields are derived when the current reflection coefficient at tall object top is zero and return stroke propagation speed in the lightning channel is equal to the speed of light. Further, we investigate the effects of current reflection coefficient at tall object top being not zero and the propagation speed is less than the speed of light (e.g., one half) on electromagnetic fields. Interestingly, we find that the vertical electric field has its largest peak value either at the smallest elevation angle or at the largest elevation angle. While for the azimuthal magnetic field, we note that its largest peak value is always at the smallest elevation angle or relatively small elevation angles.
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