Observations of unstable atmospheric shear layers in the lower E region in the post‐midnight auroral oval
Observations of unstable atmospheric shear layers in the lower E region in the post‐midnight auroral oval
复制标题
午夜后极光椭圆区下部 E 区不稳定大气切变层的观测
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
C. D. Odom
中科院分区：
文献类型：
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作者：
M. Larsen;A. Christensen;C. D. Odom
对极光椭圆区午夜后区域中性风廓线的观测表明，在受干扰的情况下，在 110-120 公里高度附近形成了窄急流。射流底部的剪切高度不稳定，理查森数接近或低于临界值 0.25。不稳定的剪切力意味着该部分大气中的湍流以及涡流扩散率将会增强。
Observations of the neutral wind profiles in the post‐midnight sector of the auroral oval show the development of a narrow jet near 110–120 km altitude during disturbed conditions. The shears on the bottom side of the jet are highly unstable with Richardson numbers near or below the critical value of 0.25. The unstable shears imply that turbulence and, consequently, the eddy diffusivity will be enhanced in that part of the atmosphere.