We report on observations of electromagnetic ion cyclotron (EMIC) waves and their interactions with injected ring current particles and high energy radiation belt electrons. The magnetic field experiment aboard the twin Van Allen Probes spacecraft measured EMIC waves near L = 5.5–6. Particle data from the spacecraft show that the waves were associated with particle injections. The wave activity was also observed by a ground‐based magnetometer near the spacecraft geomagnetic footprint over a more extensive temporal range. Phase space density profiles, calculated from directional differential electron flux data from Van Allen Probes, show that there was a significant energy‐dependent relativistic electron dropout over a limited L‐shell range during and after the EMIC wave activity. In addition, the NOAA spacecraft observed relativistic electron precipitation associated with the EMIC waves near the footprint of the Van Allen Probes spacecraft. The observations suggest EMIC wave‐induced relativistic electron loss in the radiation belt.

中文翻译：

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注入相关的电磁离子回旋加速器波引起的粒子损失观测

我们报告了电磁离子回旋加速器（EMIC）波及其与注入的环流粒子和高能辐射带电子的相互作用的观察结果。孪生Van Allen Probes航天器上的磁场实验在L  = 5.5-6附近测量了EMIC波。来自航天器的粒子数据表明，这些波与粒子注入有关。在更广泛的时间范围内，也通过航天器地磁足迹附近的地面磁力计观测到了波活动。根据Van Allen Probes的定向微分电子通量数据计算出的相空间密度分布图表明，在有限的L范围内，存在着明显的依赖于能量的相对论电子下降EMIC波活动期间和之后的弹壳范围。此外，NOAA航天器还观测到了与Van Allen Probes航天器足迹附近的EMIC波有关的相对论电子降水。观测结果表明EMIC波在辐射带中引起了相对论电子损失。