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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Mesoscale Plasma Convection Perturbations in the High-Latitude Ionosphere
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Mesoscale Plasma Convection Perturbations in the High-Latitude Ionosphere

机译：中尺度等离子体对流扰动高纬度地区电离层

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摘要

An investigation of flow perturbations with spatial scale sizes between 100 and 500 km in the high-latitude ionosphere is presented. These localized flow perturbations are deviations from the large-scale background convection, expected to give us new insights into the magnetosphere-ionosphere coupling process. Ion drift measurements from the Defense Meteorological Satellite Program F17 are utilized to identify these mesoscale flow perturbations. Our intent is to discover the properties of these perturbations in terms of perturbation flow speeds, location, scale size, and occurrence frequency as well as their dependence on the interplanetary magnetic field (IMF) and underlying large-scale convection pattern. Observation suggests that flow perturbation locations strongly depend on the IMF orientation as does the occurrence frequency of the flow perturbations. For southward IMF, more flow perturbations occur in regions of sunward background flow than in regions of antisunward background flow. For flow perturbations with speeds over 300 m/s, an asymmetry in the preferred direction and scale size is seen for those embedded in sunward and antisunward background flows. Significantly less asymmetry is present for flow perturbations with speeds between 100 and 300 m/s. The flow perturbations exceeding 300 m/s are most likely closed locally with lower magnitude return flows or with adjacent flows across the convection reversal boundary and representing additional sources of frictional heating and momentum transfer to the thermosphere. The perturbation flow speed is almost independent of the scale size and underlying convection speed, but the largest speeds are preferentially seen at scale sizes between 200 and 300 km.
机译：流扰动的调查100和500公里之间的空间规模大小高纬度地区电离层。局部流扰动偏离大型背景对流,预期给我们的新见解magnetosphere-ionosphere耦合过程。从国防漂移测量利用气象卫星计划F17识别这些中尺度流扰动。我们的目的是发现的属性扰动的扰动流速度、位置、规模大小和发生频率以及他们的依赖行星际磁场(IMF)潜在的大规模对流模式。观察表明,流扰动位置强烈依赖国际货币基金组织取向的发生频率一样流动扰动。朝着太阳的扰动发生的地区背景流antisunward的地区背景流。300 m / s的速度,一个不对称的首选方向和规模大小这些嵌入朝着太阳和antisunward背景流。现在流扰动的速度在100年和300 m / s。超过300 m / s在本地最有可能关闭级较低的流动或返回相邻流对流逆转边界和代表额外的来源摩擦加热和动量转移热大气层。几乎独立的大小和规模潜在的对流速度,但最大的速度优先在规模大小200至300公里。

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