Energetic Electron Injections Deep Into the Inner Magnetosphere: A Result of the Subauroral Polarization Stream (SAPS) Potential Drop
Energetic Electron Injections Deep Into the Inner Magnetosphere: A Result of the Subauroral Polarization Stream (SAPS) Potential Drop
复制标题
高能电子注入内磁层深处：亚极光极化流（SAPS）电势下降的结果
DOI：
10.1029/2018gl077969
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发表时间：
2018
影响因子：
5.2
通讯作者：
D. Turner
中科院分区：
文献类型：
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作者：
S. Lejosne;B. Kunduri;F. Mozer;D. Turner
据报道，高能（数十至数百keV）电子和离子的动力学与大尺度电场是共转和对流电场叠加的理论图像不一致。结合超双极光雷达网络，DMSP F-18和货车艾伦探测器一年的测量，我们发现，亚极光偏振流（SAP）时，高能电子已经穿透低于L = 4。在午夜前区域的等离子体激发之外，势能从离子的总能量中减去，并在SAPS开始期间添加到电子的总能量中。当高能粒子围绕地球漂移并离开SAPS方位角扇区时，这种势能被转换成径向运动。因此，当SAP包含在大尺度电场图像中时，高能电子比高能离子注入得更深，与观察结果一致。
It has been reported that the dynamics of energetic (tens to hundreds of keV) electrons and ions is inconsistent with the theoretical picture in which the large‐scale electric field is a superposition of corotation and convection electric fields. Combining one year of measurements by the Super Dual Auroral Radar Network, DMSP F‐18, and the Van Allen Probes, we show that subauroral polarization streams (SAPSs) are observed when energetic electrons have penetrated below L = 4. Outside the plasmasphere in the premidnight region, potential energy is subtracted from the total energy of ions and added to the total energy of electrons during SAPS onset. This potential energy is converted into radial motion as the energetic particles drift around Earth and leave the SAPS azimuthal sector. As a result, energetic electrons are injected deeper than energetic ions when SAPSs are included in the large‐scale electric field picture, in line with observations.
影响因子：
--
作者：
B. Kunduri;J. Baker;J. Ruohoniemi;L. Clausen;A. Grocott;E. Thomas;M. Freeman;E. Talaat
通讯作者：
B. Kunduri;J. Baker;J. Ruohoniemi;L. Clausen;A. Grocott;E. Thomas;M. Freeman;E. Talaat