摘要
利用辐射带电子大气倾角扩散的福克-普朗克方程,通过推导与拟合处理扩散系数表征式,构造二阶精度有限差分格式,给出辐射带捕获电子大气扩散损失的数值计算方法.计算高空核爆炸裂变β谱电子注入辐射带后在不同L壳上的通量损失和能谱变化,结果表明,当L<1.3时,大气作用引起的扩散损失效应明显,低能电子比高能电子消失要快,电子通量初始阶段衰减很快,随后逐渐近似成时间指数函数形式衰减.
With Fokker-Plank equation of pitch-angle diffusion,a numerical method for atmospheric diffusion loss of radiation belt trapped electrons is shown.Flux and energy spectrum are calculated as atmospheric scattering of fission β spectrum electrons injected in radiation belt by high altitude nuclear detonation.Diffusion due to atmospheric scattering is remarkable as L1.3.Low energy electrons are removed more rapidly than those with high energy.Electron flux decays rapidly at an initial phase and then decays gradually as an exponential function of time.
出处
《计算物理》
EI
CSCD
北大核心
2011年第4期569-575,共7页
Chinese Journal of Computational Physics
关键词
高空核爆炸
辐射带
捕获电子
大气扩散损失
high altitude nuclear detonation
radiation belt
trapped electrons
atmospheric diffusion loss
