Lightning strikes to tall objects: Currents inferred from far electromagnetic fields versus directly measured currents
Lightning strikes to tall objects: Currents inferred from far electromagnetic fields versus directly measured currents
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DOI：
10.1029/2007gl030870
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发表时间：
2007-10
影响因子：
5.2
通讯作者：
Y. Baba;V. Rakov
中科院分区：
文献类型：
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作者：
Y. Baba;V. Rakov
我们已经推导出高处物体遭雷击时远场到电流的转换因子，包括：(1)物体顶部的初始峰值电流，(2)物体顶部的最大峰值电流，以及(3)物体底部的峰值电流。这些远场到电流的转换因子是雷电探测网络报告的峰值电流的正确解释所必需的，在这里，每个因子都表示为(a)基于传输线模型的雷击到平坦地面的远场到电流的转换因子和(b)考虑雷击对象瞬态过程的适当校正因子的乘积。所考虑的三种情况的校正因子为：(1)ftall_ini。Top = v/(v + c), (2) ftall_top = [1 + ρbot(1 + ρtop)] v/(v + c), (3) ftall_bot = (1 + ρbot) v/(v + c)，其中ρbot和ρtop分别是向上传播波在物体底部和物体顶部的电流反射系数。
We have derived far‐field‐to‐current conversion factors for lightning strikes to tall objects for (1) the initial peak current at the object top, (2) the largest peak current at the object top, and (3) the peak current at the object bottom. These far‐field‐to‐current conversion factors are needed for proper interpretation of peak currents reported by lightning detection networks and are each expressed here as the product of (a) the far‐field‐to‐current conversion factor for lightning strikes to flat ground based on the transmission line model and (b) an appropriate correction factor to account for the transient process in the strike object. The correction factors for the three considered cases are: (1) ftall_ini.top = v/(v + c), (2) ftall_top = [1 + ρbot(1 + ρtop)] v/(v + c), and (3) ftall_bot = (1 + ρbot) v/(v + c), where ρbot and ρtop are current reflection coefficients at the object bottom and at the object top for upward‐propagating waves, respectively.