Energy dependence of relativistic electron variations in the outer radiation belt during the recovery phase of magnetic storms: Arase/XEP observations
Energy dependence of relativistic electron variations in the outer radiation belt during the recovery phase of magnetic storms: Arase/XEP observations
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磁暴恢复阶段外辐射带相对论电子变化的能量依赖性：Arase/XEP 观测
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发表时间：
2017
期刊：
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通讯作者：
N. Higashio
中科院分区：
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作者：
N. Higashio
外辐射带相对论电子加速和损失机制的研究一直是磁层物理研究中的突出问题之一。以前的研究表明，地磁暴增强或减少了外辐射带的相对论电子通量[例如，Reeves等人，2003年]。在磁暴主相电子通量下降后，在恢复相电子通量出现恢复，有时甚至增加。有两个主要的候选过程的电子加速，导致通量增强。第一个是由于电子从等离子体片到内磁层的径向输运而产生的绝热加速。与超低频（ULF）Pc5波的相互作用是一个合理的候选人，以驱动径向运输。另一个加速过程是辐射带中心的亚相对论电子向相对论能量的非绝热加速。与VLF波的相互作用被认为在内部加速中起重要作用。然而，这两个过程的相对贡献还远未被理解。
Understanding of acceleration and loss mechanisms of relativistic electrons in the outer radiation belt has been one of the outstanding problems in the magnetospheric physics. Previous studies indicate that geomagnetic storms intensify or decrease the relativistic electron fluxes in the outer radiation belt [e.g., Reeves et al., 2003]. After the flux dropout during the storm main phase, recovery and sometimes increase of the electron flux occurs during the recovery phase. There are two major candidate processes of the electron accelerations to cause the flux enhancement. The first one is the adiabatic acceleration due to radial transport of electrons from the plasma sheet to the inner magnetosphere. Interaction with ultra-low-frequency (ULF) Pc5 waves are a plausible candidate to drive the radial transport. Another acceleration process is the non-adiabatic acceleration of sub-relativistic electrons to the relativistic energies in heart of the radiation belt. The interaction with VLF waves is considered to play an important role in the internal acceleration. However, the relative contribution of the two processes are far from understood.