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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Gradient Winds and Neutral Flow Dawn-Dusk Asymmetry in the Auroral Oval During Geomagnetically Disturbed Conditions
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Gradient Winds and Neutral Flow Dawn-Dusk Asymmetry in the Auroral Oval During Geomagnetically Disturbed Conditions

机译：Dawn-Dusk梯度风和中性流不对称在极光椭圆眼睛干扰条件下

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摘要

The Pedersen component of the Lorentz force produces an acceleration that is generally in the zonal direction in much of the dawn and dusk sectors in the auroral oval. During geomagnetically disturbed conditions, as the neutral flow begins to accelerate through the ion drag force and the flow speeds increase, a balance develops in the meridional direction between the Coriolis, curvature, and pressure gradient forces, which are dominant in the lower thermosphere. The gradient wind equation that describes this balance predicts that the cyclonic flow on the dawn side is limited to the so-called regular solution, which has a maximum value of twice the geostrophic wind speed. The anticyclonic flow on the dusk side, on the other hand, can satisfy either the regular or anomalous solution with a transition at twice the geostrophic wind speed. The anomalous flow solutions have wind speeds significantly greater than the transition value, but are limited by the inertial wind value, that is, the value that corresponds to a balance between the curvature and Coriolis forces. The analysis is carried out to show this result, which indicates that a significant quantitative asymmetry is expected between the dawn- and dusk-side flow, as is observed and has been shown in both observations and a number of numerical modeling studies. Implications for the wind distribution of perturbed pressure gradients and inertial instability are discussed.
机译：皮德森组件的洛伦兹力一般在产生一个加速度纬向方向的黎明和黄昏部门在极光椭圆。眼睛干扰条件下,随着通过离子中性流开始加速阻力和流动速度增加,子午方向的平衡发展科里奥利之间、曲率和压力梯度力,也就是占主导地位的降低热大气层。描述了这种平衡预测,气旋流在黎明方面局限于所谓的常规的解决方案,最大的价值地转风速度的两倍。反气旋流在黄昏方面,一方面,可以满足正常或异常解决方案与一个过渡的两倍地转风速。解决方案有风速明显更大比转换值,但是是有限的惯性风价值,即价值对应于一个曲率之间的平衡和科里奥利力。显示这个结果,这表明一个重要的预计数量不对称黎明-和dusk-side流观察和已被证明在两个观察和大量的数值模拟研究。对风的分布的影响摄动压力梯度和惯性不稳定性进行了讨论。

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