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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Distinguishing Subauroral Ion Drifts FromBirkeland Current Boundary Flows
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Distinguishing Subauroral Ion Drifts FromBirkeland Current Boundary Flows

机译：区分Subauroral离子漂移FromBirkeland当前边界流

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摘要

The Swarm satellites regularly observe latitudinally narrow ion velocity jets exceeding 1 km/s relative to the surrounding plasma at high latitude. Two distinct categories of duskward directed flow channels are observed. The most common are situated between the Region 1 and Region 2 currents, are observed primarily during quiet geomagnetic conditions, and are called Birkeland current boundary flows. During active conditions, a second type of duskward directed ion velocity jet is observed at the equatorward edge of the Region 2 currents, colocated with a sharp poleward directed plasma density gradient, consistent with subauroral ion drifts. Pedersen current and electric field estimates from the Swarm satellites show both types of flow channel to be associated with low height-integrated Pedersen conductivity relative to the surrounding plasma. In this study we show two cases in which the Swarm satellites passed through both types of event on the same orbit, as well as the average ion velocity, field-aligned current, and plasma density surrounding 57 of these events. Some field-aligned current morphologies previously associated with subauroral ion drifts suggest that they may have instead been Birkeland current boundary flows. In this study we provide a comparative description of both phenomena to facilitate their distinction in future studies.
机译：群卫星定期观察纬度的狭窄的离子速度飞机超过1 km / s相对于周围的等离子体在高纬度。定向流动渠道。常见的是坐落在区域1和区域之间主要在区域2电流,观察安静的地磁条件,被称为Birkeland当前边界流动。条件,第二类型duskward指示离子速度喷射是朝赤道方向观察到边缘地区的2电流,托管的大幅向极等离子体密度梯度,符合subauroral离子漂移。电流和电场的估计群卫星显示这两种类型的流动通道height-integrated较低有关他相对于周围的电导率等离子体。通过这两种类型的蜂群卫星事件在同一轨道,以及平均水平离子速度、field-aligned电流和等离子体周围密度57这些事件。field-aligned当前形态之前与subauroral离子漂移他们实际上可能是Birkeland电流边界流动。比较两种现象的描述促进他们的区别在将来的研究中。

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