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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Birkeland Current Boundary Flows Associated With Field Line Resonances
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Birkeland Current Boundary Flows Associated With Field Line Resonances

机译：Birkeland当前边界流动有关场共振线

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摘要

Strong zonal flows greater than 1,000 m/s have recently been identified by Swarm in the midnight sector of the winter hemisphere auroral zone. These flows are typically observed between upward and downward field aligned current pairs and therefore are referred to as Birkeland current boundary flows (BCBFs). The Swarm observations also identify ion heating and upflows associated with the fast zonal flows. BCBFs and the resulting ion heating and upflows play an important role in thermosphere-ionosphere-magnetosphere coupling given their high occurrence rate in the quiet time nightside auroral zone. This paper utilizes Super Dual Auroral Radar Network (SuperDARN) highresolution fits to line-of-sight data to investigate two known BCBF events. The large (>2,000 m/s) BCBFs observed with Swarm A and B are found to be collocated with the location of field line resonances (FLRs) with periods of approximately 20–30 min. The SuperDARN high-resolution fits determine FLR peak flow velocities of 400–700 m/s. When the FLR velocities are superimposed upon the background ionospheric convection of 400–600 m/s, this yields total east-west velocities of 800–1,300 m/s near the time and location of the BCBF events. The peak flows of the field line resonances are shown to be bounded by pairs of upward and downward field aligned current similar to the BCBFs. The observations suggest a causal relationship between BCBFs and FLRs.
机译：强大的纬向流大于1000 m / s最近被群在午夜部门的冬季半球极光区。这些流动通常观察之间的上升和向下字段当前双和保持一致因此被称为Birkeland电流边界流(BCBFs)。也确定相关离子加热和上升气流的快速区域流动。产生的离子加热和上升气流发挥重要的作用thermosphere-ionosphere-magnetosphere耦合考虑到他们在安静的出现率高时间阴面极光区。超级双极光雷达网络(SuperDARN)highresolution视距数据相吻合两个已知BCBF事件进行调查。(> 2000 m / s) BCBFs观察群A和B发现并置的位置吗场线共振(flr)的时期大约20 - 30分钟。SuperDARN高分辨率适合确定FLR最大流量400 - 700 m / s的速度。速度是叠加在背景上400 - 600 m / s,电离层对流收益率总东西速度800 - 1300m / s BCBF的时间和地点附近事件。共振是由成对的证明是有界的向上和向下领域对齐当前相似BCBFs。BCBFs和flr之间的关系。

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