We studied the temperature and the emission of 557.7 nm in the MLT in the geophysical observatory “Tory” (51.8N, 103.1E) during winter 2018-2019. For analysis, we used the measurement data of the Fabry-Perot interferometer (FPI), the SABER/TIMED data, the data of the model of middle and upper atmosphere (MUAM) and the data of the ERAinterim archive. It turned out that MLT emission is decreases during an increase in the amplitude of a stationary planetary wave with a zonal wave number 1 in the stratosphere, as well as during sudden stratospheric warmings. However, the temperature according to the FPI data increases, and according to the SABER data temperature decreases during these events in the stratosphere. In this paper we discuss the reasons for these differences, which are caused by a variation in the height of the emission layer and by the features of the SABER observations. The MUAM data confirm our assumptions about the reasons for the differences between SABER and FPI temperature.
The mesosphere and lower thermosphere are the least studied areas of the earth atmosphere. The reason for this is the lack of monitoring. We have instrument for measuring wind speed - the Fabry-Perot interferometer of the ISTP SB RAS which was used for study atmosphere dynamics in two winter periods - 2016/2017 and 2017/2018. Sudden stratospheric warming's (SSW) are investigated according to the ERA-Interim reanalysis archive. In 2017 and 2018, the interferometer data on wind speed at an altitude of 90 km showed a responses to the SSW, with different vertical and horizontal structure, which were occurred at the different of the quasi-biennial oscillation phases.