采用壳模型分析深空核爆在远场产生辐射电磁脉冲的规律，对深空核爆电磁脉冲的形成机理进行研究。在已知电子运动规律的前提下，推导了发射电子的电偶极矩表达式，并得到了辐射电磁脉冲的特性。计算结果表明:远处辐射场的峰值电场与爆炸当量无关，但达到峰值的时间随爆炸当量增加而提前；电子初始动能的增大也能线性地提高峰值强度；峰值强度与上升时间常数及弹体半径的平方成正比。

A preliminary understanding of electromagnetic pulse generated by nuclear explosions in space has been developed with case signal model. For observers in large distances, a net dipole can be resulted from the average movements of space charges. Based on the law of electron movements, the electric dipole moment of the whole system has been analytically described. The radiation fields are closely related to the derivatives of the dipole moment with time. The peak value of radiation signal in far field increases linearly with the initial kinetic energies of electrons, and quadratically with the radius of bomb and with the rise time constant. The peak is irrelevant to explosion yield, while the peak time will be postponed as the yield decreases.