Statistical Comparison of Electron Loss and Enhancement in the Outer Radiation Belt During Storms
Statistical Comparison of Electron Loss and Enhancement in the Outer Radiation Belt During Storms
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DOI：
10.1029/2021ja030069
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
S. Walton;C. Forsyth;I. J. Rae;N. Meredith;J. Sandhu;M. Walach;K. Murphy
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文献类型：
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作者：
S. Walton;C. Forsyth;I. J. Rae;N. Meredith;J. Sandhu;M. Walach;K. Murphy
外货车艾伦辐射带中的近相对论电子数是高度动态的，并与地磁活动（如风暴和亚暴）强烈耦合，这些活动是由磁层与太阳风的相互作用驱动的。电子的能量、含量和空间范围在外部辐射带中可以在数小时到数天的时间尺度上变化，这取决于加速和损失过程的不断演变的影响。虽然电子布居的净变化可以直接观察到，但不同过程的相对影响远未完全理解。利用太阳异常磁层粒子探测器上质子电子望远镜连续12年的数据集，我们统计比较了被困电子的相对变化，反弹损失锥（BLC）。结果表明，在风暴主相和恢复初期，进入等离子体层顶外BLC的通量成比例地增加。损耗增强在整个恢复阶段在黎明侧持续，而黄昏侧的损耗在最小Sym-H附近增强并迅速减小。空间变化也被检查与地磁活动，比较可能的因果波模式，如哨声模式合唱和等离子体层嘶嘶声。
The near‐relativistic electron population in the outer Van Allen radiation belt is highly dynamic and strongly coupled to geomagnetic activity such as storms and substorms, which are driven by the interaction of the magnetosphere with the solar wind. The energy, content, and spatial extent of electrons in the outer radiation belt can vary on timescales of hours to days, dictated by the continuously evolving influence of acceleration and loss processes. While net changes in the electron population are directly observable, the relative influence of different processes is far from fully understood. Using a continuous 12 year data set from the Proton Electron Telescope on board the Solar Anomalous Magnetospheric Particle Explorer, we statistically compare the relative variations of trapped electrons to those in the bounce loss cone (BLC). Our results show that there is a proportional increase in flux entering the BLC outside the plasmapause during storm main phase and early recovery phase. Loss enhancement is sustained on the dawnside throughout the recovery phase while loss on the duskside is enhanced around minimum Sym‐H and quickly diminishes. Spatial variations are also examined in relation to geomagnetic activity, making comparisons to possible causal wave modes such as whistler‐mode chorus and plasmaspheric hiss.