We investigate the rare events of sudden appearances of relativistic electrons (>700 keV), which are normally confined to the Van Allen belts, in the slot region. The frequency of occurrence of these events is on average 1–2 per year. To cope with the scarcity of events, in this study, we examine 21 years of trapped relativistic electron fluxes available from the POES and MetOp Space Environment Monitor (SEM‐2). Our statistical analysis shows that these events can occur even during moderate geomagnetic activity. Occurrence of these events correlates with high‐speed solar winds or interplanetary coronal mass ejections depending on the phase of the solar cycle. A strong correlation of these events is found with ultra‐low frequency (ULF) wave activity, which can be used to predict these events with more than 75% accuracy.

中文翻译：

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范艾伦带刺及其与太阳风，地磁活动和超低频波的关系

我们研究狭缝区域内相对论电子突然出现的罕见事件（> 700 keV），这些现象通常局限于范艾伦带。这些事件的发生频率平均每年为1-2次。为了应对事件的稀缺性，在本研究中，我们检查了可从POES和MetOp空间环境监视器（SEM-2）获得的21年的相对论电子通量。我们的统计分析表明，即使在中等地磁活动期间，也可能发生这些事件。这些事件的发生与高速太阳风或行星际冠状物质抛射有关，这取决于太阳周期的相位。这些事件与超低频（ULF）波活动密切相关，可用于预测这些事件的准确度超过75％。