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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Formation of the low-latitude boundary layer and cusp under the northward IMF: Simultaneous observations by Cluster and Double Star
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Formation of the low-latitude boundary layer and cusp under the northward IMF: Simultaneous observations by Cluster and Double Star

机译：低纬度边界层的形成尖端向北下国际货币基金组织(IMF):同步观察集群和双星

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摘要

On 28 February 2004 the configuration of the Cluster and Double Star TC1 satellites facilitated a simultaneous study of plasma properties inside the low-latitude boundary layer (LLBL) near the subsolar magnetopause and inside the midaltitude cusp during an interval with strong northward IMF. TC1, crossing the dayside magnetopause, observed a complex structure of boundary layers. We suggest that one part of the LLBL, characterized by high fluxes of magnetosheath-like electrons, is formed due to reconnection processes. We can identify three different plasma populations inside this region: on open field lines outside the magnetopause which are reconnected in the northern hemisphere lobe sector; on open field lines inside the magnetosphere which are reconnected in the northern hemisphere lobe sector and sink inside the magnetosphere; and on reclosed field lines, which undergo a second reconnection in the southern hemisphere lobe sector. Another part of the LLBL, characterized by equal fluxes of magnetosheath-like and plasma sheet populations, is formed by diffusion processes as strong pitch angle diffusion and formation of a loss cone are observed inside this region. Cluster, moving from the polar cap toward the dayside magnetosphere via the cusp region, crossed many different sublayers with different plasma properties. Comparison of plasma populations inside the different subregions of the LLBL and cusp shows that the complex LLBL observed at the dayside magnetopause maps into the midaltitude cleft/cusp region and that observed sublayers inside the cusp can be explained by reconnection in the lobe sector of one or both hemispheres and by diffusion processes.
机译：2004年2月28日的配置集群和双星TC1卫星方便的同时研究等离子体在低纬度边界层特性(LLBL)靠近赤道的磁层和内部的间隔期间的midaltitude尖端强大的国际货币基金组织(IMF)向北。磁层,观察到一个复杂的结构边界层。LLBL,高通量的特征magnetosheath-like电子,形成原因重新连接过程。不同的等离子体的数量在这个地区:在磁层外开放电场线重新连接在北半球吗叶部门;磁气圈的连接北半球叶部门和水槽内磁气圈;进行第二次重新连接的吗南半球叶部门。LLBL,特点是平等的通量magnetosheath-like和等离子板数量,球场是由扩散过程一样强壮吗角扩散和损失锥的形成观察到在这个地区。极地帽的光面磁气圈通过尖端区域,跨越了许多不同子层与不同的等离子体特性。内的等离子体数量比较不同亚区LLBL和尖端的节目复杂LLBL观察到的光面磁层映射到midaltitude裂/尖端区域内,观察子层叶尖端可以解释为重新连接部门的一个或两个半球扩散过程。

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