斜向通道地表雷电电磁脉冲场分布规律研究

通过分解电流微元偶极子并求解Maxwell方程组，得到了斜向通道雷电电磁脉冲(Lightning Electromagnetic Pulse，LMEP)场解析表达式；基于此斜向通道模型，研究了不同方位角和回击速度时的雷电电磁场分布规律.结果显示：近场区电场分量随方位角的变化规律要受到放电通道倾斜程度的影响，但是其他场区的电场分量和任意场区的磁场分量初始峰值均会随方位角的增加而减小；当回击速度改变时近场区电磁场分布规律保持不变，但在中间场和远场区电磁场初始峰值将随回击速度的增大而增大.

Distribution law of surficial LEMP for oblique channel

The analytical expression of oblique channel lightning electromagnetic field is obtained by decomposing the micro dipole and solving the Maxwell’s equations.The distribution laws of lightning electromagnetic fields with different azimuth and return-stroke speed is researched based on oblique channel model.The results show that tilt degree of oblique channel affects the distribution laws of electric field component variation with azimuth in near area， but the initial peak of electric field in intermediate area and far area as well as the magnetic field in any field area decrease with the increasing of azimuth.When lightning return stroke speed changes， the distribution laws of electromagnetic field in near area is unchanged， the initial peak of electromagnetic field in intermediate area and far area increases with the increasing of return stock speed.