To study the effects of earth magnetic field and altitude on fast NEMP produced by γ rays, low latitude area is selected as the research object. Through calculation, the effects of the varying earth magnetic field at different distances from the explosion center and the steady magnetic field to the transverse electric field are analyzed and compared. The results indicate that the effect is greater while the explosion altitude is higher. The results agree with the deposit height of γ rays and its varying disciplinarian according to energy and altitude.%为了研究地磁场以及高度因素对高空核爆中射线产生的快核电磁脉冲的影响,选取了低纬度地区作为研究对象,通过计算,对比分析了距爆心不同距离处变化地磁场与稳恒磁场对横向电场的影响,表明地磁场对高空核爆的影响比对低空核爆的影响大,结果与射线的沉积高度以及随当量和距离的变化规律相吻合.
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