A long-term statistical analysis of thermospheric tides in an altitude range from 150 to 400 km is presented. The analysis is based on a dataset with 31 multi-day experiments conducted from an incoherent scatter radar at Arecibo Observatory between 1984 and 2015. This is the first time that the climatological mean and seasonal variations of the thermospheric tides and their response to solar activities are reported using an extensive dataset. The climatological mean amplitude of diurnal tide (DT) is dominant while the amplitudes of the semidiurnal tide (SDT) and terdiurnal tide (TDT) are comparable. Below 250 km, the SDT and TDT phases show downward propagation with vertical wavelengths of 300 and 240 km, respectively. Above 250 km, the DT is the most prominent component except in autumn while the SDT dominates below 250 km except in winter. Above 250 km, the DT is the strongest in winter and its amplitude varies around 28 m/s. Below 250 km, the SDT is prominent in autumn and fluctuates around 35 m/s. The TDT is the most important in winter compared to the other three seasons and its amplitude is slightly less than 20 m/s. The DT and SDT amplitudes show the opposite response to solar activity. Above 250 km, the former increases with increasing solar activity while the latter is the opposite. The enhanced DT amplitude and its phase structure under the high solar activity indicates that the in-situ EUV radiation plays a major role in generating the thermospheric DT over Arecibo.

提出了在150至400 km高度范围内的热层潮汐的长期统计分析。该分析基于1984年至2015年之间在阿雷西博天文台的非相干散射雷达进行的31个多日实验的数据集。使用广泛的数据集进行报告。昼间潮汐（DT）的气候平均振幅是主要的，而半昼间潮汐（SDT）和昼间潮汐（TDT）的振幅是可比较的。在250 km以下，SDT和TDT相位分别以300 km和240 km的垂直波长向下传播。在250 km以上，除秋季以外，DT是最突出的组成部分，而在250 km以下，除冬季以外，SDT占主导地位。在250 km以上，DT是冬季最强的，其振幅变化约为28 m / s。在250 km以下，SDT在秋季很显着，大约以35 m / s的速度波动。与其他三个季节相比，冬季的TDT最重要，其幅度略小于20 m / s。DT和SDT幅度显示出对太阳活动的相反响应。在250 km以上，前者随太阳活动的增加而增加，而后者则相反。在高太阳活动下增强的DT振幅及其相结构表明，原位EUV辐射在生成Arecibo上的热层DT中起主要作用。与其他三个季节相比，冬季的TDT最重要，其幅度略小于20 m / s。DT和SDT振幅显示出对太阳活动的相反响应。在250 km以上，前者随太阳活动的增加而增加，而后者则相反。在高太阳活动下增强的DT振幅及其相结构表明，原位EUV辐射在生成Arecibo上的热层DT中起主要作用。与其他三个季节相比，冬季的TDT最重要，其幅度略小于20 m / s。DT和SDT振幅显示出对太阳活动的相反响应。在250 km以上，前者随太阳活动的增加而增加，而后者则相反。在高太阳活动下增强的DT振幅及其相结构表明，原位EUV辐射在生成Arecibo上的热层DT中起主要作用。