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首页> 外文期刊>Geophysical Research Letters >Mid-latitude reflection of ion upflows during substorm dipolarization
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Mid-latitude reflection of ion upflows during substorm dipolarization

机译：亚暴双极化期间离子流的中纬度反射

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Reconfiguration of the magnetospheric current system during the expansion phase of substorms leads to dipolarization of the magnetic field lines in the inner plasma sheet. This process is characterized by inward field line motion the equatorial region and outward motion at mid-latitudes. We investigate the parallel motion of ions during such dynamical reconfigurations. We demonstrate that, in contrast to equatorial latitudes where ions are centrifugally jetted toward the midplane and experience prominent energization, ions at mid-latitudes are subjected to a downward (earthward) oriented acceleration. We accordingly show that ions with small parallel speeds such as those originating from the topside ionosphere may be decelerated upon reaching midlatitudes and return to low altitudes. Field line dipolarization during substorms may thus go together with substantial downward flow of low-energy ions, as evidenced from measurements of the low-altitude orbiting Interball-Auroral spacecraft. [References: 14]
机译：在亚暴的扩展阶段，磁层电流系统的重新配置导致内部等离子板中的磁场线发生双极化。该过程的特征是赤道区域向内运动，而在中纬度向外运动。我们研究了这种动态重构过程中离子的平行运动。我们证明，与赤道纬度的离子朝中平面离心喷射并经历显着的激励作用相反，中纬度的离子受到向下（向地球）方向的加速度。因此，我们表明，平行速度较小的离子（例如来自顶部电离层的离子）在到达中纬度时可能会减速并返回低海拔。因此，亚暴期间的场线偶极极化可能会伴随着低能量离子的大量向下流动，这从对低空轨道运行的球间极光航天器的测量中可以看出。 [参考：14]

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