闭合磁场线恢复足点对称性的动力学效应
Dynamic effects of restoring footpoint symmetry on closed magnetic field lines
摘要：
在这里，我们提出了一个事件，同时全球成像的极光从两个半球揭示了一个大的纵向移动的夜侧极光约3小时，是最大的相对位移共轭极光成像报告。这被解释为闭合磁力线具有非常不对称的足点的证据，与事件之前和期间行星际磁场的持续正$\textit{y}$分量有关。与此同时，超级双极光雷达网观测两个半球的电离层夜侧对流咽喉区。雷达资料表明，在南半球的黄昏细胞的向阳面更快的对流相比，其共轭区域。我们解释这是一个签名的过程中采取行动，以恢复对称的位移封闭磁场线，导致通量管沿香蕉细胞移动速度比共轭橙色细胞。正如Tenfjord等人最近描述的那样，该事件被重点分析了与此恢复过程相关的Birkeland电流（BC）。使用的数据，从活动磁层和行星电动力学响应实验（AMPERE）在相同的条件下，所提出的事件，大规模的BC模式与事件。它显示了恢复对称性的过程对BC的预期影响。因此，我们建议，这些意见应被认为是恢复足点对称性的动力学效应的结果，在夜面的封闭场线。
英文摘要：
Here we present an event where simultaneous global imaging of the aurora from both hemispheres reveals a large longitudinal shift of the nightside aurora of about 3 h, being the largest relative shift reported on from conjugate auroral imaging. This is interpreted as evidence of closed field lines having very asymmetric footpoints associated with the persistent positive $\textit{y}$ component of the interplanetary magnetic field before and during the event. At the same time, the Super Dual Auroral Radar Network observes the ionospheric nightside convection throat region in both hemispheres. The radar data indicate faster convection toward the dayside in the dusk cell in the Southern Hemisphere compared to its conjugate region. We interpret this as a signature of a process acting to restore symmetry of the displaced closed magnetic field lines resulting in flux tubes moving faster along the banana cell than the conjugate orange cell. The event is analyzed with emphasis on Birkeland currents (BC) associated with this restoring process, as recently described by Tenfjord et al. (2015). Using data from the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) during the same conditions as the presented event, the large-scale BC pattern associated with the event is presented. It shows the expected influence of the process of restoring symmetry on BCs. We therefore suggest that these observations should be recognized as being a result of the dynamic effects of restoring footpoint symmetry on closed field lines in the nightside.
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