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首页> 外文期刊>Atmospheric research >Influence Of Channel Tortuosity On The Lightning Return Stroke Electromagnetic Field In The Time Domain
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Influence Of Channel Tortuosity On The Lightning Return Stroke Electromagnetic Field In The Time Domain

机译：时域通道曲折度对雷电回击电磁场的影响

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摘要

The effect of lightning channel tortuosity on the associated electromagnetic (EM) fields in the time domain is investigated quantitatively from a new point of view. Due to the vanishing of geometric symmetry when taking into account the tortuosity of lightning channels, it is necessary to calculate the associated EM fields in the Cartesian coordinate system. An efficient technique is adopted to produce tortuous lightning channels and then the fractal dimension of the channel is calculated automatically by a program. The results show that at close distances, the dependence of EM fields on azimuth is significant, the ratio of MF peaks at two coaxial points with the channel base may reach about 4 and that of the EF may be larger than 2. With increased distance, the dependence of waveform on azimuth weakens. At distances of 10 km and 100 km, the current peaks derived from the EF peaks show good consistency with the current peak adopted, with an uncertainty less than 25%.
机译：从新的角度定量研究了雷电通道曲折度对时域相关电磁场的影响。考虑到雷电通道的曲折性时，由于几何对称性的消失，有必要计算笛卡尔坐标系中的相关电磁场。采用一种有效的技术来产生弯曲的雷电通道，然后由程序自动计算通道的分形维数。结果表明，在近距离处，电磁场对方位角的依赖性很大，与通道底部的两个同轴点的MF峰的比率可能达到约4，而EF的比率可能大于2。波形对方位角的依赖性减弱。在10 km和100 km的距离处，从EF峰得到的电流峰与采用的电流峰显示出良好的一致性，不确定度小于25％。

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