Lightning Current Waveforms Inferred From Far-Field Waveforms for the Case of Strikes to Tall Objects
Lightning Current Waveforms Inferred From Far-Field Waveforms for the Case of Strikes to Tall Objects
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DOI：
10.1109/temc.2023.3261422
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发表时间：
2023-08
影响因子：
2.1
通讯作者：
S. Koike;Y. Baba;T. Tsuboi;V. Rakov
中科院分区：
文献类型：
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作者：
S. Koike;Y. Baba;T. Tsuboi;V. Rakov
雷击高大物体产生的远距离电场和磁场与雷击平地产生的电场和磁场不同。具体地，在对高物体的撞击的情况下，由于高物体的顶部和底部处的电流反射，波形是振荡的。本文提出了一种由高物体雷击远场的波形重建平地雷击远场波形的方法。一旦从测量的场波形中去除高撞击物体的影响，就估计撞击到平坦地面的通道基极电流。此外，基于通道的电流波形用于找到沿着雷击物体和闪电通道两者的任何高度处的电流波形。本文在二维柱坐标系下，用时域有限差分法计算了雷击高大物体的远场电场。雷电回击可用传输线模型、电流随高度线性衰减的修正传输线模型或电流随高度指数衰减的修正传输线模型来表示。
Electric and magnetic fields at far distances produced by lightning strikes to tall objects are different from those associated with lightning strikes to flat ground. Specifically, in the case of strikes to tall objects, the waveforms are oscillatory because of current reflections at the top and bottom of the tall object. In this article, a procedure to reconstruct the waveform of far electric field due to the lightning strike to flat ground from the corresponding waveform of far electric field due to a lightning strike to a tall object is proposed. Once the effect of tall strike object is removed from the measured field waveform, the channel-base current for the strike to flat ground is estimated. Further, the channel-base current waveform is used to find the waveform of current at any altitude along both the strike object and the lightning channel. Computations of far electric fields due to lightning strikes to tall objects are carried out using the finite-difference time-domain method in the two-dimensional cylindrical coordinate system. The lightning return stroke is represented by the transmission-line (TL) model, the modified TL model with linear current decay with height, or the modified TL model with exponential current decay with height.