Modeling of outer radiation belt electrons by multidimensional diffusion process
Modeling of outer radiation belt electrons by multidimensional diffusion process
复制标题
通过多维扩散过程模拟外辐射带电子
DOI：
10.1029/2008ja013580
复制
发表时间：
2009-03-03
影响因子：
2.8
通讯作者：
Wang, Shui
中科院分区：
文献类型：
--
作者：
Xiao, Fuliang;Su, Zhenpeng;Wang, Shui
[1]在这项研究中，我们开发了一个新的代码，它使用混合有限差分（HFD）方法来解决一个2-D反弹平均能量俯仰角扩散方程的外辐射带。我们实现的数值算法，采用分裂算子技术，隐式计划处理对角扩散系数，和交替方向隐式计划非对角（或交叉）扩散系数。我们表明，我们的代码HFD可以成功地克服不稳定的问题时，包括大的和快速变化的交叉扩散系数。特别是，我们研究是否共振相互作用与斜传播的哨声模式合唱和嘶嘶声波的结果在一个净加速或损失的相对论电子在外辐射带L = 4.5。数值模拟表明，合唱波可以产生显着的相对论性电子加速，而嘶嘶声波主要负责散射赤道镜像电子朝向损失锥。
[1] In this study, we develop a new code which uses a hybrid finite difference (HFD) method to solve a 2-D bounce-averaged energy-pitch angle diffusion equation in the outer radiation belts. We implement the numerical algorithm by adopting a split operator technique, an implicit scheme for dealing with diagonal diffusion coefficients, and an alternative direction implicit scheme for off-diagonal (or cross) diffusion coefficients. We show that our code HFD can successfully overcome the unstable problem when the large and rapidly varying cross diffusion coefficients are included. Particularly, we examine whether resonant interactions with obliquely propagated whistler mode chorus and hiss waves result in a net acceleration or loss of relativistic electrons in the outer radiation belt L = 4.5. Numerical simulations show that chorus waves can yield significant acceleration of relativistic electrons, while hiss waves are primarily responsible for scattering equatorially mirroring electrons toward the loss cone.