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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Mesoscale F Region Neutral Winds Associated With Quasisteady and Transient Nightside Auroral Forms
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Mesoscale F Region Neutral Winds Associated With Quasisteady and Transient Nightside Auroral Forms

机译：中性风与中尺度F区域拟定和瞬态阴面极光形式

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摘要

High-latitude neutral winds often circulate in a two-cell pattern as driven by large-scale auroral forcing. However, auroral forcing also occurs in various types of mesoscale forms (i.e., tens to hundreds of kilometers in space and a few to tens of minutes in time) and contains more energy input over mesoscale than large scale. A question arises as to whether and how winds respond to the mesoscale forcing. We characterize F region winds associated with various types of auroral forms using scanning Doppler imagers, auroral imagers, and radars. The auroras examined include a quasi-steady east-west elongated arc, a quasi-steady Harang aurora, transient streamers, and a transient substorm westward traveling surge. We find that winds exhibit distinct spatial structures, appearing as channels, vortices, and reversals. Such structures are consistent with the structures of the plasma flows associated with the auroras. Winds exhibit a temporal evolution very similar to the plasma flows and reach maximum perturbations only <~20 min after the flows. The above results suggest that the thermosphere is closely coupled to the ionosphere/magnetosphere through the ion drag force. The<~20-min time scale can be partially explained by the strong ionization effect associated with the auroras and partially by the fact that the wind perturbations do not approach the flow perturbations but halt at ~20% possibly due to momentum forces other than the ion drag.
机译：高纬度地区中性风经常在一个循环两个模式由大规模的极光强迫。各种类型的中尺度形式(例如,数以千万计数百公里的空间和十几个分钟的时间),包含更多的能量输入比大中尺度的规模。是否出现,风如何应对中尺度强迫。与各种类型的极光形式使用多普勒扫描影像,极光影像,和雷达。准稳定的东西长弧,准恒定Harang极光,短暂的飘带,和瞬态亚暴向西旅行激增。空间结构,出现通道,漩涡,逆转。与等离子体的结构一致流与极光。等离子体的演化非常相似流和达到最大扰动只< ~ 20分钟后流。热电离层是紧密耦合的通过离子拖动电离层/磁气圈力。用强烈的电离效应来解释与的极光和部分相关事实风扰动的方法流扰动但在~ 20%可能停止由于动量部队除了离子拖动。

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