In safeguarding electronic systems and structures against the potent electromagnetic pulses generated by lightning, it is crucial to integrate lightning protection measures with an understanding of the negative downward-leader lightning current and the corresponding electromagnetic field characteristics. This article undertakes a numerical analysis of both the lightning current stroke and the far-radiated EM field, incorporating a conductive ground and utilizing our revised MTLE model intended for elevated objects. Validated for its ability to predict the close EM field around the struck object, the model demonstrates efficacy in numerical simulations carried out using the finite-difference time-domain method to anticipate the far-EM field. By juxtaposing model predictions with real experimental data, the results reveal reasonable agreements, reflected in a low root-mean-square error.

中文翻译：

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负向下行先导电流与闪电产生的相关远电磁场的数值模拟

为了保护电子系统和结构免受雷电产生的强电磁脉冲的影响，将防雷措施与了解负向下先导雷电电流和相应的电磁场特性结合起来至关重要。本文对雷击电流和远辐射电磁场进行了数值分析，结合了导电接地并利用了我们针对高架物体修订的 MTLE 模型。该模型经过验证能够预测被撞击物体周围的近距离电磁场，并展示了使用时域有限差分方法进行数值模拟来预测远电磁场的有效性。通过将模型预测与真实实验数据并列，结果显示出合理的一致性，这反映在较低的均方根误差上。