Temporal and Spatial Correspondence of Pc1/EMIC Waves and Relativistic Electron Precipitations Observed With Ground-Based Multi-Instruments on 27 March 2017
Temporal and Spatial Correspondence of Pc1/EMIC Waves and Relativistic Electron Precipitations Observed With Ground-Based Multi-Instruments on 27 March 2017
复制标题
2017年3月27日地基多仪器观测到的Pc1/EMIC波与相对论性电子降水的时空对应关系
DOI：
10.1029/2018gl080126
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
Albert J. M.
中科院分区：
文献类型：
--
作者：
Hirai A.;Tsuchiya F.;Obara T.;Kasaba Y.;Katoh Y.;Misawa H.;Shiokawa K.;Miyoshi Y.;Kurita S.;Matsuda S.;Connors M.;Nagatsuma T.;Sakaguchi K.;Kasahara Y.;Kumamoto A.;Matsuoka A.;Shoji M.;Shinohara I.;Albert J. M.
电磁离子回旋（EMIC）波通过俯仰角散射可能导致相对论电子从外辐射带向大气的沉降损失。然而，每个EMIC波元素和降水爆发的直接证据尚未报道。在这里，我们展示了2017年3月27日磁暴期间EMIC波与相对论电子沉淀（REP）的时空对应关系。在北美的几个观测站观测到了EMIC波。REP是在加拿大阿萨巴斯卡观测到的亚电离层无线电振幅的下降。当孤立的质子极光，观察在阿萨巴斯卡，出现在无线电传播路径上，我们发现了一个很好的对应关系之间的时间变化的REP和EMIC波，和REP之前EMIC波24秒。这一时间滞后与相对论电子和EMIC波从磁层赤道平面到电离层的传播时间差是一致的。
Electromagnetic ion cyclotron (EMIC) waves potentially cause precipitation loss of relativistic electrons from the outer radiation belt to the atmosphere through pitch angle scattering. However, the direct evidence of each EMIC wave element and burst of precipitation has not yet been reported. Here we show the temporal and spatial correspondence of the EMIC waves with relativistic electron precipitation (REP) during the geomagnetic storm of 27 March 2017. EMIC waves were observed at several stations in North America. REP was detected as a decrease of subionospheric radio amplitudes observed at Athabasca, Canada. When isolated proton aurora, observed at Athabasca, appeared on the radio propagation path, we found a good correspondence between the temporal variations of REP and EMIC waves, and REP preceded EMIC waves by 24 s. This time lag is consistent with the travel time difference between relativistic electrons and EMIC waves from the magnetospheric equatorial plane to the ionosphere.