## 6 Conclusions  
Within this paper, we studied the nighttime atmospheric temperature and 557.7 nm line intensity over the south of East Siberia at the altitudes of 85-100 km in 2017-2021. We adapted and visualized the considered atmospheric parameters obtained with SABER, SATI and FPI instruments and NRLMSIS data.  
A comparison of seasonal temperature variations within the Tory GPO region from ground, satellite and model data showed their good consistency except the summer and autumn period where the FPI temperatures turned out to be significantly lower than those from SABER and NRLMSIS. The difference in summer and autumn temperatures from satellite and ground-based instruments is presumably related to the intensity behavior as the effective temperature is calculated using the height profile of 557.7 nm emission. The model and satellite data show similarities both in temperature variations and in the monthly average altitude of minimal temperature.  
According to the analysis of annual variations in 557.7 nm emission intensity from data from the satellite, ground-based instruments and model, differences are seen in April and in September-November. Intensity from the NRLMSIS data differs from the rest in April; this is presumably related to the fact that the model does not account for the latitudinal features of the occurrence of 557.7 nm emission or climate changes in this region. High values of SABER intensity in summer can be driven by the residual effect from solar airglow after dawn, due to which some photochemical processes can be missed in the model calculating the I 557.7 nm. The FPI maximum intensity in autumn is hard to explain, while the NRLMSIS model implies its presence, so further studies are required. Differences  
Figure 10: Monthly average altitude of maximum atomic oxygen concentration and average statistical deviations from 2017 to 2021 by SABER (red) and NRLMSIS model (blue).  
in the intensity measurements with ground-based instruments in the summer and autumn seasons are probably related to weather conditions (cloud, fog), since FPI data were selected only on clear sky days, and SATI data were not filtered; hence, the spectrometer-obtained intensity is lower during this period. One of the assumptions was that the oxygen emission at 557.7 nm, obtained with the FPI, may be partly due to the precipitation of particles due to geomagnetic activity, but the auroral oval rarely reaches our latitudes [28].  
Conceptualization, methodology and project administration, R.V.; software, data analysis and visualization, A.S.; writing--review and editing, O.Z.; providing data and editing, M.A.; providing data and editing, A.M. All authors have read and agreed to the published version of the manuscript.  
The monitoring of emission layers with the FPI and SATI instruments and data storage were financially supported by the Ministry of Science and Higher Education of the Russian Federation (Subsidy No.075-GZ/C3569/278). The study of the features of seasonal variations in temperature and 557.7 nm emission from ground, satellite and model data was supported by the Russian Science Foundation, Project no. 22-77-1000s \"Studies of large-scale events in the lower and middle atmosphere and estimate of their local influence at the heights of the mesosphere-lower thermosphere\".  
Not applicable.  
The authors declare no conflict of interest.