A Procedure to Infer Lightning Return-Stroke Current Waveform From Far-Field Waveform for the Case of Lossy Ground
A Procedure to Infer Lightning Return-Stroke Current Waveform From Far-Field Waveform for the Case of Lossy Ground
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DOI：
10.1109/temc.2023.3325280
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发表时间：
2024-04
影响因子：
2.1
通讯作者：
Shunsuke Koike;Masahiro Fukuyama;Yoshihiro Baba;Toshihiro Tsuboi;V. Rakov
中科院分区：
文献类型：
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作者：
Shunsuke Koike;Masahiro Fukuyama;Yoshihiro Baba;Toshihiro Tsuboi;V. Rakov
针对电流随高度线性衰减和指数衰减的修正传输线模型，提出了从理想导电地面上相应的远电场波形（仅辐射场分量）重构通道基电流波形的表达式。采用时域有限差分法（FDTD）求解二维柱坐标系下离散的麦克斯韦方程组，计算了远距离（50-200 km）有耗地面上的垂直电场波形。有耗地面上的垂直电场的FDTD计算波形的传播效应进行了补偿，并用于所提出的场到电流的转换表达式推断的通道的基础电流波形。重建的电流与计算有耗地面上的场所用的电流非常一致。
We proposed expressions for reconstructing the waveform of channel-base current from the corresponding far electric field waveform (radiation field component only) on perfectly conducting ground for the modified transmission line models with linear and exponential current decay with height. Waveforms of vertical electric field on lossy ground at far distances (50–200 km) were computed using the finite-difference time-domain (FDTD) method for solving discretized Maxwell's equations in the 2-D cylindrical coordinate system. The FDTD-computed waveforms of vertical electric field on lossy ground were compensated for propagation effects and used in the proposed field-to-current conversion expressions for inferring the channel-base current waveform. The reconstructed currents are in excellent agreement with the current used in computing the fields on lossy ground.