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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Comparison of energetic electron flux and phase space density in the magnetosheath and in the magnetosphere
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Comparison of energetic electron flux and phase space density in the magnetosheath and in the magnetosphere

机译:比较充满活力的电子通量和阶段在磁鞘和空间密度磁气圈

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摘要

Whether energetic electrons (10s of keV) in the magnetosheath can be directly transported into the magnetosphere and further energized through radial diffusion is significant in understanding the physical mechanisms for producing the radiation belt electrons (>100s of keV) in the magnetosphere. In this study, we analyze more than two hundred magnetopause crossing events using the energetic electron and magnetic field measurements from Geotail and compare the flux and phase space density (PSD) of the energetic electrons on both sides of the magnetopause. It is found that for most of the events (>70%), the fluxes and PSDs of energetic electrons in the magnetosheath are less than those in the magnetosphere, suggesting that the energetic electrons in the magnetosheath cannot be a direct source sufficient for the energetic electrons inside the magnetosphere. In fact, our analysis suggests a possible leakage of the energetic electrons from inside to outside the magnetopause. By investigating the average energetic electron flux distribution in the magnetosheath, we find that the energetic electron fluxes are higher near the bow shock and the magnetopause than in between. The high energetic electron flux near the bow shock can be understood as due to energization of electrons when they go through the bow shock. The relatively low flux of the energetic electrons in between indicates that it is difficult for the energetic electrons to travel from the bow shock to the magnetopause and vice versa, possibly because the energetic electrons near the bow shock and the magnetopause are all on open magnetic field lines and these two relatively intense energetic electron populations in the magnetosheath rarely get mixed.
机译:是否精力充沛电子(10年代keV)可以直接运输到磁鞘磁气圈,进一步激励径向扩散的理解具有重要意义产生的物理机制凯文的辐射带电子(> 100年代)磁气圈。超过二百磁层穿越事件使用高能电子和磁场测量从Geotail和通量进行比较和相空间密度(PSD)的能量电子磁层的两侧。发现大部分的事件(> 70%),通量和PSDs的高能电子磁鞘是不足的磁气圈,表明精力充沛磁鞘中电子不能直接源足够高能电子在磁气圈。表明可能泄漏的精力充沛电子从内到外磁层。精力充沛的电子通量分布磁鞘中,我们发现,精力充沛电子通量高弓形激波附近磁层之间。高能电子通量弓形激波附近理解为由于电子激发当他们穿过弓形激波。相对较低的能量电子通量表明它是困难的精力充沛的电子从弓形激波磁层,反之亦然,可能因为附近的高能电子弓震惊和磁层都在开放磁场线和这两个相对强烈的高能电子人群磁鞘很少得到混合。

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