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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Dual-Lobe Reconnection and Horse-Collar Auroras
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Dual-Lobe Reconnection and Horse-Collar Auroras

机译：Dual-Lobe重新连接和马项圈极光

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摘要

We propose a mechanism for the formation of the horse-collar auroral configuration during periods of strongly northward interplanetary magnetic field (IMF), invoking the action of dual-lobe reconnection (DLR). Auroral observations are provided by the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite and spacecraft of the Defense Meteorological Satellite Program (DMSP).We also use ionospheric flow measurements from DMSP and polar maps of field-aligned currents (FACs) derived from the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE). Sunward convection is observed within the dark polar cap, with antisunward flows within the horse-collar auroral region, together with the NBZ FAC distribution expected to be associated with DLR.We suggest that newly closed flux is transported antisunward and to dawn and dusk within the reverse lobe cell convection pattern associated with DLR, causing the polar cap to acquire a teardrop shape and weak auroras to form at high latitudes. Horse-collar auroras are a common feature of the quiet magnetosphere, and this model provides a first understanding of their formation, resolving several outstanding questions regarding the nature of DLR and the magnetospheric structure and dynamics during northward IMF. The model can also provide insights into the trapping of solar wind plasma by the magnetosphere and the formation of a low-latitude boundary layer and cold, dense plasma sheet.We speculate that prolonged DLR could lead to a fully closed magnetosphere, with the formation of horse-collar auroras being an intermediate step.
机译：我们建议的形成机制马项圈极光配置期间强烈的向北行星际磁场字段(IMF),调用dual-lobe的作用重新连接(DLR)。提供的Magnetopause-to-Aurora成像仪卫星和全球勘探(图片)宇宙飞船的防御气象卫星计划(DMSP)。流量测量DMSP和极地的地图(流式细胞仪)源自field-aligned电流活跃的磁气圈和行星电动力学响应实验(安培)。朝着太阳对流内观察到黑暗中极地冰冠,antisunward流内马项圈极光区域,一起NBZ FAC分布相关与经销商。运输antisunward黎明和黄昏相反的叶细胞内对流模式与经销商联系在一起,导致极地冰冠获得一个泪珠形状和疲软的极光的形成在高纬度地区。安静的磁气圈的共同特征这个模型提供了一个第一的理解它们的形成,解决几个突出DLR的性质和相关的问题磁性层的结构和动力学国际货币基金组织(IMF)向北。洞察太阳风等离子体的捕获通过磁气圈的形成低纬度边界层和寒冷,密集等离子体单。可能导致一个完全封闭的磁气圈,马项圈极光的形成是一个中间步骤。

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