Rapid injection of MeV electrons associated with strong substorm dipolarization has been suggested as a potential explanation for some radiation belt enhancement events. However, it has been difficult to quantify the contribution of MeV electron injections to radiation belt enhancements. This paper presents two isolated MeV electron injection events for which we quite precisely quantify how the entire outer‐belt immediately changed with the injections. Tracking detailed outer‐belt evolution observed by Van Allen Probes, for both events, we identify large step‐like relativistic electron enhancements (roughly 1 order of magnitude increase for ∼2 MeV electron fluxes) for L ≳ 3.8 and L ≳ 4.6, respectively, that occurred on ∼30‐min time scales nearly instantaneously with the injections. The enhancements occurred almost simultaneously for 10s keV to multi‐MeV electrons, with the lowest L of enhancement region located farther out for higher energy. The outer‐belt stayed at these new levels for ≳several hours without substantial subsequent enhancements.

中文翻译：

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MeV电子的快速注入和极快的阶跃式外部辐射带增强

与强次风暴双极化有关的MeV电子的快速注入已被建议作为某些辐射带增强事件的潜在解释。但是，很难量化MeV电子注入对辐射带增强的贡献。本文介绍了两个孤立的MeV电子注入事件，针对这些事件我们非常精确地量化了整个外部带如何随注入而立即变化。跟踪由范艾伦探测器观察到的详细外带进化，对于两个事件，我们确定阶梯状大相对论电子增强（大致1个阶的数量级的增加为〜2 MeV的电子通量），用于大号 ≳3.8和大号 ≳4.6大约在注射时立即在约30分钟的时间范围内发生。增强几乎同时发生在10s keV到多MeV电子之间，增强区的最低L位于较高能量处。外部皮带在几个小时内都保持在这些新的水平上，而随后没有任何实质性的增强。