Effect of low energy electron injection on storm-time evolution of radiation belt energetic electrons: three-dimensional modeling
Effect of low energy electron injection on storm-time evolution of radiation belt energetic electrons: three-dimensional modeling
复制标题
低能电子注入对辐射带高能电子风暴时间演化的影响：三维建模
DOI：
10.1007/s10509-014-1984-x
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发表时间：
2014-06
影响因子：
1.9
通讯作者：
Fuliang Xiao
中科院分区：
文献类型：
--
作者：
Zhonglei Gao;Qinghua Zhou;Chang Yang;Fuliang Xiao
利用电子辐射带的风暴时间演化程序（STEERB），模拟了在低能电子注入的情况下，磁暴期间辐射带高能电子的演化。采用STEERB程序求解三维Fokker-Planck扩散方程，该方程包含波粒相互作用、库仑碰撞和径向扩散。数值模拟结果表明，在短时间（101 h）注入低能（0.1MeV ≤Ek≤ 0.2MeV）辐射带高能电子通量的情况下，在整个暴期内，高能电子通量都会增加。在主要和恢复阶段，这种注入有效地增强了合唱驱动的加速辐射带高能电子，允许高1-2个数量级的因子比那些在没有注入的高能电子通量。目前的结果表明，亚暴诱导的电子注入必须纳入研究辐射带高能电子的演变。
Using the STEERB (storm-time evolution of electron radiation belt) code, we simulate the evolution of radiation belt energetic electrons during geomagnetic storms in the case of low energy electron injection. The STEERB code is used to solve the three-dimensional Fokker–Planck diffusion equation which incorporates wave-particle interaction, Coulomb collisions and radial diffusion. Numerical simulations show that under the short time (∼1 h) injection of low energy (0.1 MeV≤Ek≤0.2 MeV) fluxes of radiation belt energetic electrons can increase during the entire storm period. During the main and recovery phases, such injection efficiently enhances chorus-driven acceleration of radiation belt energetic electrons, allowing fluxes of energetic electrons by a factor of 1–2 orders higher than those in the absence of injection. The current results indicate that substorm-induced electron injection must be incorporated to investigate the evolution of radiation belt energetic electrons.
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