基于中国岢岚地区法布里-珀罗干涉仪的风场及行星波观测特征

Characteristics of Wind and Planetary Waves Based on FPI over Kelan of China

利用中国岢岚站(38.7°N,111.6°W)法布里-珀罗干涉仪2013年7月至2014年11月的水平风场数据,对87,97,250 km风场长期变化和行星波特征进行了研究.通过分析年振荡(AO)和半年振荡(SAO)振幅相位,将午夜风场与HWM07数据对比发现:87km和97km处FPI纬向风变化趋势与HWM07相近,而经向风相位落后于HWM07,从振幅上看,HWM07振幅偏大;250 km处风场月变化大,FPI与HWM07差异大,HWM07模式的准确性需进一步考虑太阳活动和行星际磁场的影响.利用Lomb-scargle功率谱以及最小二乘谐波拟合提取了三个高度的行星波振幅,其特征表明87km和97km处纬向风16日波秋季及冬春季活动强,而6.5日波最强振幅出现在春季和秋季,在中间层顶附近两种行星波活动均较弱;250km处经向行星波活动略强于纬向,经向风不同周期带的行星波最强振幅主要出现在5-9月,与电离层f_0F_2振荡特性的研究结果一致.

The horizontal wind data observed by Fabry-Perot Interferometer（FPI） over Kelan,China, has been used to investigate the characteristics of wind and planetary waves at altitudes of 87, 97 and 250 km. Firstly, the midnight winds have been compared with those from HWM07.The results are as follows. At 87 and 97 km, the AO（Annual Oscillation） and SAO（Semiannual Oscillation） phases of zonal wind of FPI tend to consist with those from HWM07, while the phases of FPI meridional wind lag behind. Both the zonal and meridional FPI amplitudes are smaller. It shows large discrepancies between FPI and HWM07 winds, which reveals that the improvement of HWM07 model needs to further consider the influence of solar activity and interplanetary magnetic field. Secondly, the Lomb-Scargle analysis and the least squares harmonic fitting method have been used to derive the amplitudes of planetary waves at the three altitudes. At 87 and 97 km, the 16-day waves are prominent at autumn, winter and spring during 2013-2014, while the 6.5-day waves tend to dominant spring and autumn. Both of the two planetary waves have weak amplitudes around mesopause. The amplitudes are stronger in meridional wind than zonal at 250 km. Three typical planetary wave period bands of meridional wind show that the strongest amplitudes persist from May to October. This is consist with the results of ionospheric f_0F_2 oscillations.