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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Varying interplanetary magnetic field B_y effects on interhemispheric conjugate auroral features during a weak substorm
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Varying interplanetary magnetic field B_y effects on interhemispheric conjugate auroral features during a weak substorm

机译：不同的话行星际磁场的影响在两半球间的共轭极光特性在弱亚暴

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摘要

Interhemispheric conjugate auroral features during a weak substorm interval were investigated using simultaneous all-sky camera (ASC) measurements at the northern and southern geomagnetic conjugate points at Tjornes (TJO; 66.2°N, 342.9°E) in Iceland and Syowa Station (SYO; 69.0°S, 39.6°E) in Antarctica. Around postmidnight, just after the substorm onset, the ASC field of view (FOV) at TJO was first filled with dynamic auroral activations; however, its counterpart was not detected over the zenith at SYO at that time. In contrast, in the late stage (about 20 min after the onset) of substorm development we observed spiral-like auroral arcs with a similar shape drifting eastward across the center of each ASC FOV, although the one at TJO preceded the one at SYO. The time sequence of the interhemispheric conjugate auroral features was well reflected in the geomagnetic field variations at both stations. On the basis of a detailed comparison of both ASC images, we identified that the northern geomagnetic footprint of SYO was displaced poleward of TJO by up to 3.0° or more in the initial stage of substorm development, whereas in the late stage it was displaced eastward by up to ～1 h relative to TJO and then moved closer to TJO. We emphasize that the dynamic motion of the conjugate points is a consequence of the time-dependent magnetotail field reconfiguration process, controlled by the varying interplanetary magnetic field B_y polarity.
机译：在两半球间的共轭极光特性疲软的亚暴间隔进行使用同时全天相机(ASC)测量北部和南部地磁共轭点Tjornes (TJO;冰岛和Syowa站(SYO;在南极洲。亚暴发作,ASC的视野(FOV)在TJO第一次充满活力的极光激活;发现在天顶SYO。相反,在晚期(约20分钟后我们观察到的亚暴发展的开始)spiral-like极光弧与类似的形状东漂流每个ASC的中心FOV,尽管一个TJO之前的SYO。共轭极光特性反映在在地磁场的变化电台。ASC的图像,我们确认北方的地磁SYO的足迹流离失所的TJO向极3.0°或更多在亚暴发展的初始阶段,而在后期流离失所东的~ 1 h相对于TJO然后TJO靠拢。是一个动态运动的共轭点由于时间的磁尾场重构过程,控制的不同的行星际磁场的话极性。

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