Numerical simulations of storm-time outer radiation belt dynamics by wave-particle interactions including cross diffusion
Numerical simulations of storm-time outer radiation belt dynamics by wave-particle interactions including cross diffusion
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DOI：
10.1016/j.jastp.2009.08.002
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发表时间：
2011
影响因子：
1.9
通讯作者：
Z. Su;Huinan Zheng;Liangxu Chen;Shui Wang
中科院分区：
文献类型：
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作者：
Z. Su;Huinan Zheng;Liangxu Chen;Shui Wang
使用最近开发的混合有限差分（HFD）代码，我们通过交叉螺距角能量扩散求解二维弹跳平均福克 - 普朗克方程，以评估风暴期间由多个波粒相互作用驱动的电子相空间密度（PSD）演化。数值结果表明，~MeV电子的PSD在主阶段期间可以在较低桨距角处耗尽两个数量级，主要是由于嘶嘶声和电磁离子回旋加速器（EMIC）波的桨距角散射，然后在恢复阶段与暴风前状态相比增强两个数量级，主要是由于合唱波的加速。此外，还确定了交叉项和各种电磁波的影响。
Using the recently developed hybrid finite difference (HFD) code, we solve the two-dimensional bounce-averaged Fokker–Planck equation with cross-pitch-angle-energy diffusion to evaluate the electron phase space density (PSD) evolution driven by multiple wave–particle interactions during storms. Numerical results show that PSDs of ∼MeV electrons can be depleted by two orders of magnitude at lower pitch-angles during the main phase primarily due to pitch-angle scattering by hiss and electromagnetic ion cyclotron (EMIC) waves, and then enhance by two orders of magnitude compared with the prestorm state during the recovery phase primarily due to acceleration by chorus wave. Furthermore, the effects of the cross terms and various electromagnetic waves are also been identified.