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为了解中国北纬40°上空过渡流区大气月平均状态,使用热层-电离层-中间层大气能量与动力/宽频辐射计大气探测卫星资料,选取北京和酒泉上空50~110km高度2003-2014年共计12a的温度和密度数据,采用Lomb-Scargle谱分析方法分析了两站资料的周期特征、温度和密度周期随大气高度的变化特征,以及太阳活动对过渡流区的影响。结果表明:过渡流区的大气状态随经度变化很小,大气温度随时间变化呈现显著的4个月震荡和年震荡,自然年内温度的4个月震荡在过渡流区底层和顶层具有同位相特征,在中层为反位相特征;大气密度随时间存在半年变化和年变化特征,90km以下以年变化为主,90km以上年变化和半年变化同时存在;过渡流区上层温度和密度受到太阳活动的影响显著,强弱随月份变化。
In order to understand the average monthly state of the atmosphere over the transitional zone over 40 ° N in North China, atmospheric data from atmospheric-satellite data of thermal layer-ionosphere-middle layer atmospheric energy and dynamic / broadband radiometer were used to select the altitude of 50 ~ 110 km above Beijing and Jiuquan. A total of 12a temperature and density data were used to analyze the periodic characteristics of the two stations’ data, the variation of temperature and density cycles with the atmospheric height, and the effects of solar activity on the transitional flow area using Lomb-Scargle spectral analysis. The results show that the atmospheric state of the transitional area changes little with the longitude, and the temperature changes with time show a significant 4-month concussion and annual concussion. During the natural year, the 4-month concussion of temperature has the same-phase characteristics in the bottom and top of the transitional area , And the anti-phase features in the middle layer. The atmospheric density has six months of annual variation and annual variation with time, with annual variation below 90 km, and annual and semi-annual changes above 90 km simultaneously; the temperature and density of the upper transitional area are affected by the solar activity Significantly, the strength changes with the month.