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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt
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Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt

机译:依赖资源的模拟电子扩散流程在地球外辐射带

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The radial and local diffusion processes induced by various plasma waves govern the highly energetic electron dynamics in the Earth's radiation belts, causing distinct characteristics in electron distributions at various energies. In this study, we present our simulation results of the energetic electron evolution during a geomagnetic storm using the University of California, Los Angeles 3-D diffusion code. Following the plasma sheet electron injections, the electrons at different energy bands detected by the Magnetic Electron Ion Spectrometer (MagEIS) and Relativistic Electron Proton Telescope (REPT) instruments on board the Van Allen Probes exhibit a rapid enhancement followed by a slow diffusive movement in differential energy fluxes, and the radial extent to which electrons can penetrate into depends on energy with closer penetration toward the Earth at lower energies than higher energies. We incorporate radial diffusion, local acceleration, and loss processes due to whistler mode wave observations to perform a 3-D diffusion simulation. Our simulation results demonstrate that chorus waves cause electron flux increase by more than 1 order of magnitude during the first 18 h, and the subsequent radial extents of the energetic electrons during the storm recovery phase are determined by the coupled radial diffusion and the pitch angle scattering by EMIC waves and plasmaspheric hiss. The radial diffusion caused by ULF waves and local plasma wave scattering are energy dependent, which lead to the observed electron flux variations with energy dependences. This study suggests that plasma wave distributions in the inner magnetosphere are crucial for the energy-dependent intrusions of several hundred keV to several MeV electrons.
机译:径向和地方诱导扩散过程由不同的等离子体波管理高度地球的高能电子动力学辐射带,导致截然不同的特点在电子分布在不同的能量。这项研究中,我们提出我们的仿真结果高能电子在进化使用大学的磁暴洛杉矶加州三维扩散代码。等离子体电子板注射后,在不同能量电子乐队磁电子离子谱仪(MagEIS)和相对论性电子质子望远镜(报告)仪器上货车随之而来的是艾伦调查表现出迅速增强慢扩散运动的微分能量流和径向程度电子能渗入取决于能量与紧密渗透向地球较低能量比更高的能量。径向扩散,当地加速度,和损失由于惠斯勒模式波的观测过程执行三维扩散模拟。仿真结果表明,合唱导致电子通量增加超过1在第一次18 h级,随后的径向区段之间的能量电子在暴风雨中复苏阶段由耦合径向扩散和决定位的波和螺旋角散射plasmaspheric嘶嘶声。由当地ULF波和等离子体波散射能源的依赖,导致观察到的电子通量变化与能源依赖性。本研究表明,等离子体波内部磁场的分布的能量依赖性入侵的关键几百keV几兆电子伏电子。

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