Seasonal and solar cycle variations in high- latitude thermospheric winds
Seasonal and solar cycle variations in high- latitude thermospheric winds
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DOI：
10.1029/91gl02240
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发表时间：
1991-11
影响因子：
5.2
通讯作者：
A. Aruliah;D. Rees;A. Steen
中科院分区：
文献类型：
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作者：
A. Aruliah;D. Rees;A. Steen
九年多来，每年冬天都从瑞典基律纳（北纬67.8度，东经20.4度）的高纬度地点系统地收集热层风测量数据。该数据库包含1，242个夜晚的数据，这些数据是由法布里-珀罗干涉仪（FPI）收集的，这可能是最大的热层风单点数据库。这种分析显示出明显的季节和太阳周期变化。特别是在太阳活动高的时候，晚风（16-20 UT）在春分比秋分强50%以上。在春分和秋分高纬度热层风的行为中的这种大的不对称性还没有被模式模拟预测到。
Thermospheric wind measurements have been collected systematically every winter for over nine years from a high-latitude site at Kiruna, Sweden (67.8{degree}N, 20.4{degree}E). The database contains 1,242 nights of data collected with a Fabry-Perot Interferometer (FPI), perhaps the largest single-site database of thermospheric winds. This analysis shows a marked seasonal and solar cycle variation. Particularly at high solar activity, sunward winds of the evening period (16-20 UT) are more than 50% stronger at Spring than at Autumn equinox. This large asymmetry in the behavior of high-latitude thermospheric winds at spring and autumn equinox has not yet been predicted by model simulations.