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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ionospheric signatures of internal reconnection for northward interplanetary magnetic field: Observation of “reciprocal cells” and magnetosheath ion precipitation
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Ionospheric signatures of internal reconnection for northward interplanetary magnetic field: Observation of “reciprocal cells” and magnetosheath ion precipitation

机译：北向行星际磁场内部重新连接的电离层特征：“互易细胞”和磁石离子沉淀的观察

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摘要

Magnetic reconnection that involves overdraped lobe field lines is called internal reconnection since it occurs inside the magnetopause. When the interplanetary magnetic field (IMF) is due northward and the Earth's dipole is tilted significantly, internal reconnection occurs in the winter hemisphere, not only between a summer lobe field line and a winter lobe field line but also between a summer lobe field line and a closed field line. The latter internal reconnection drives “reciprocal cells” in the winter ionosphere that circulate exclusively in the closed field line region. The reciprocal cells are intimately related to the lobe cells in the summer ionosphere in that in the steady state, the reconnection voltage associated with merging of IMF and open field lines is equal to the sum of the lobe cell potential and the reciprocal cell potential. In this paper we present observations of convection patterns consistent with those expected for reciprocal cells, using ionospheric radar and low-altitude satellite data. We also show the concurrence of lobe cells and reciprocal cells. The observations of reciprocal cells provide support for the internal reconnection between a summer lobe field line and a closed field line. In addition, we show that equatorward of the polar cap boundary, magnetosheath-like ions are drifting from noon toward the flankside in both hemispheres. We suggest that these ions are of magnetosheath origin and that they entered the closed region of the magnetosphere through the rotational discontinuity associated with internal reconnection. These magnetosheath-like ion observations strongly support the occurrence of internal reconnection.
机译：涉及重瓣波场线的磁重连称为内部重连，因为它发生在磁层顶内部。当行星际磁场（IMF）向北倾斜并且地球的偶极子大幅倾斜时，冬季半球不仅在夏季波场线与冬季波场线之间，而且在夏季波场线与磁场之间也发生内部重新连接。封闭的场线。后者的内部重新连接驱动冬季电离层中的“相互电池”，这些电池仅在封闭的场线区域中循环。互易细胞与夏季电离层中的叶细胞密切相关，因为在稳定状态下，与IMF和开放磁场线合并相关的重新连接电压等于叶细胞电势和相互细胞电势的总和。在本文中，我们使用电离层雷达和低空卫星数据对流模式的观测结果与对等单元的对流模式进行了观测。我们还显示了叶细胞和倒数细胞的并发。倒数细胞的观察为夏季叶场线和封闭场线之间的内部重新连接提供了支持。另外，我们表明，在极帽边界的赤道线上，类磁石似的离子在两个半球中都从中午向侧面移动。我们建议这些离子来自磁荒，并且它们通过与内部重新连接相关的旋转不连续性进入磁层的封闭区域。这些类似磁石的离子观测结果强烈支持内部重新连接的发生。

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