Prompt injections of highly relativistic electrons induced by interplanetary shocks: A statistical study of Van Allen Probes observations
Prompt injections of highly relativistic electrons induced by interplanetary shocks: A statistical study of Van Allen Probes observations
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DOI：
10.1002/2016gl071628
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发表时间：
2016-12
影响因子：
5.2
通讯作者：
Q. Schiller;S. Kanekal;L. Jian;X. Li;A. Jones;D. Baker;A. Jaynes;H. Spence
中科院分区：
文献类型：
--
作者：
Q. Schiller;S. Kanekal;L. Jian;X. Li;A. Jones;D. Baker;A. Jaynes;H. Spence
本文对2012 ~ 2015年范艾伦探测器时代外辐射带电子在行星际（IP）冲击下的突然响应进行了统计研究。范艾伦探测器上的相对论电子-质子望远镜仪器的数据被用来研究冲击后最初几分钟内的高度相对论电子响应（e> 1.8 MeV）。我们研究了激波参数（如马赫数）与高相对论性电子响应的关系，包括激波诱导注入的光谱性质和径向位置。研究发现，激波的太阳风驱动结构并不影响增强事件的发生，25%的激振与快速充能有关，14%的激振与MeV电子耗竭有关。研究发现，代表IP冲击强度的参数与最高激活水平的相关性最好，这表明冲击强度可能在增强的严重程度中起关键作用。然而，并不是每一次冲击都会导致增强，这表明可能需要磁层预处理。
We conduct a statistical study on the sudden response of outer radiation belt electrons due to interplanetary (IP) shocks during the Van Allen Probes era, i.e., 2012 to 2015. Data from the Relativistic Electron‐Proton Telescope instrument on board Van Allen Probes are used to investigate the highly relativistic electron response (E > 1.8 MeV) within the first few minutes after shock impact. We investigate the relationship of IP shock parameters, such as Mach number, with the highly relativistic electron response, including spectral properties and radial location of the shock‐induced injection. We find that the driving solar wind structure of the shock does not affect occurrence for enhancement events, 25% of IP shocks are associated with prompt energization, and 14% are associated with MeV electron depletion. Parameters that represent IP shock strength are found to correlate best with highest levels of energization, suggesting that shock strength may play a key role in the severity of the enhancements. However, not every shock results in an enhancement, indicating that magnetospheric preconditioning may be required.