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目的深入了解掌握临近空间大气风场的扰动状态,给临近空间飞行器的精确入轨、有效运行提供可靠的环境信息。方法用昆明站(25.6°N,103.8°E)临近空间观测平台中的MF雷达开展临近空间大气风场扰动观测。基于谐波拟合方法得到昆明地区2008年8月至2010年8月期间的周日和半日潮汐分量及背景风场,分析昆明地区临近空间80~100 km之间潮汐波动的变化特征。结果周日潮汐振幅具有明显的年变化和半年变化,最大值均出现在10月份和3月份的86~92 km高度范围内,同时第一年度的潮汐幅度明显强于第二年度,类似准两年变化。纬向半日潮汐的变化特征不是非常明显,而经向半日潮汐在88~94 km之间具有年变化,在其他高度处则出现多个峰值。结论潮汐相位的变化结果表明潮汐的下行传播,潮汐振幅的高度变化符合先增大后减小的特征,呈现胞状结构。
Objective To know more about the disturbance of the wind field near the space and provide reliable environment information for the accurate orbit and effective operation of the near space vehicle. Methods Using the MF radar in the near-surface observation platform of Kunming Station (25.6 ° N, 103.8 ° E), the disturbance of the wind field in the adjacent space was observed. Based on the harmonic fitting method, the tidal component and background wind field of the sun and half day in Kunming from August 2008 to August 2010 were obtained. The variation characteristics of tidal fluctuation between 80 ~ 100 km near the space in Kunming were analyzed. Results The tidal amplitude on Sunday had significant annual and semi-annual variations with the maximum occurring within the range of 86-92 km in October and March. Meanwhile, the tidal amplitude in the first year was significantly stronger than that in the second year, Year change. The semi-diurnal tidal variation in the zonal direction is not very obvious, while the half-trough in the trough has annual variation between 88-94 km and multiple peaks at other altitudes. Conclusion The results of tidal phase change indicate that the tidal descent propagates and the tidal amplitude amplitude changes in accord with the characteristics of first increasing and then decreasing, presenting the cellular structure.