The coupling response between solar wind structures and the magnetosphere is highly complex, leading to different effects in the outer radiation belt electron fluxes. Most Coronal Mass Ejections cause strong geomagnetic storms with short recovery phases, often 1–2 days. By contrast, High-Speed Solar Wind Streams lead to moderate and weak storms often with much longer recovery phases, from several to ∼10 days. The magnetosphere receives energy for a long time under the influence of the HSSs, considerably changing its dynamics. This in turn has an effect on the charged particles trapped in the outer radiation belt. Although the high-energy electron flux enhancements have received considerable attention, the high-energy electron flux enhancement pattern (L > 4) has not. This paper identifies 37 events with this enhancement pattern in the high-energy electron flux during the Van Allen Probes era. We find the enhancements coincident with HSS occurrence. The interplanetary magnetic field (IMF) exhibits north/south Bz fluctuations of Alfvénic nature with moderate amplitudes. The high-energy electron flux enhancements also correspond to long periods of auroral activity indicating a relationship to magnetotail dynamics. However, the AE index only reaches moderate values. Ultra-Low Frequency waves were present in all of the events and whistler-mode chorus waves were present in 89.1% of the events, providing a convenient scenario for wave-particle interactions. The radial gradient of the ULF wave power related to the L, under the influence of the HSSs, is necessary to trigger the physical processes responsible for this type of high-energy electron flux enhancement pattern.

中文翻译：

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外辐射带中高能电子通量增强模式响应高速太阳风流中的阿尔文波动：统计分析

太阳风结构与磁层之间的耦合响应非常复杂，导致外辐射带电子通量产生不同的影响。大多数日冕物质抛射会导致强烈的地磁风暴，恢复阶段很短，通常为 1-2 天。相比之下，高速太阳风流导致中度和弱风暴，通常具有更长的恢复阶段，从数天到 10 天不等。磁层在 HSS 的影响下长时间接收能量，显着改变其动力学。这反过来又会对捕获在外辐射带中的带电粒子产生影响。尽管高能电子通量增强受到了相当大的关注，但高能电子通量增强模式（L > 4) 没有。本文确定了范艾伦探测器时代高能电子通量中具有这种增强模式的 37 个事件。我们发现增强与 HSS 发生一致。行星际磁场 (IMF) 表现出阿尔文性质的北/南 Bz 波动，幅度适中。高能电子通量增强也对应于长期的极光活动，表明与磁尾动力学的关系。然而，AE指数仅达到中等值。所有事件中都存在超低频波，89.1% 的事件中存在哨声模式合唱波，为波粒相互作用提供了便利的场景。与L相关的 ULF 波功率的径向梯度在 HSS 的影响下，有必要触发导致这种类型的高能电子通量增强模式的物理过程。