Dayside cusp aurorae are created from particles precipitating into the cusp, and ionospheric convection is driven by solar wind electric fields. In this study, we coordinated the observations obtained from the all‐sky camera on Svalbard, the Super Dual Auroral Radar Network, SuperMAG magnetometer data, and far ultraviolet imagers on board the Defense Meteorological Satellite Program satellites for the event January 4, 2014 to examine the morphology of aurorae and the patterns of ionospheric convection for radial interplanetary magnetic field (IMF). During the event, a poleward‐moving auroral form and antisunward ionospheric convection were observed when the IMF turned into almost purely radial. Moreover, both types of antisunward and sunward convection were simultaneously observed near the footprint of the cusp at different times during the radial IMF period. The antisunward convection and sunward convection are typically an indicator of the dayside reconnection for the southward IMF and the lobe reconnection for the northward IMF, respectively. All those observations support the concept of low‐latitude dayside and high‐latitude lobe reconnection for the radial IMF. This study further shows that the coexistence of the two types of reconnection for radial IMF, resulting in an interplay of repetitive antisunward and sunward convection.

中文翻译：

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径向星际磁场下的日间尖峰极光和电离层对流

白天的尖头极光是由沉淀到尖头的颗粒产生的，电离层对流是由太阳风电场驱动的。在这项研究中，我们协调了从2014年1月4日美国国防气象卫星计划卫星上的斯瓦尔巴群岛全天候相机，超级双极光雷达网络，SuperMAG磁强计数据和远紫外成像仪获得的观测结果，以检查径向星际磁场（IMF）的极光形态和电离层对流模式。在活动期间，当IMF变成几乎完全呈放射状时，观察到极极移动的极光形式和反日电离层对流。而且，在径向IMF期间的不同时间，在尖点的足迹附近同时观察到了两种类型的逆向和对流对流。逆向对流和正向对流通常分别指示向南的IMF的日间重新连接和向北的IMF的凸角重新连接的指示器。所有这些观察结果都支持径向IMF的低纬度白天和高纬度叶重新连接的概念。这项研究进一步表明，径向IMF的两种类型的重新连接并存，从而导致重复的反日对流和日向对流相互影响。所有这些观察结果都支持径向IMF的低纬度白天和高纬度叶重新连接的概念。这项研究进一步表明，径向IMF的两种类型的重新连接并存，从而导致重复的反日对流和日向对流相互影响。所有这些观察结果都支持径向IMF的低纬度白天和高纬度叶重新连接的概念。这项研究进一步表明，径向IMF的两种类型的重新连接并存，从而导致重复的反日对流和日向对流相互影响。