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 work continues the research started in 2017. In 2018 in addition to constant monitoring of the night sky glow, a series of experiments were carried out to register fast variations in the spatial intensity distribution of the night sky radiation in the spectral range of 400–900 nm by an optical instruments complex. The devices complex includes: A photometer assembled on the basis of SONY ICX285AL CCD matrix and a high-aperture lens Jupiter 3; Highly sensitive optical system created on the basis of the 3rd generation EPM102G-04-22C electron-optical converter (EOC) and the Baumer HXG40NIR camera based on CMOSIS CMV4000 1 matrix; Fast four-channel photometer with sensors based on silicon photomultipliers. The paper presents the results of experiments on the synchronous observation of fast optical phenomena in the Earth’s atmosphere. The number of events recorded simultaneously on multiple devices is given. We describe methods and algorithms for extracting events from data series.
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.
We present preliminary observational results of short-period variations in the night sky airglow at middle latitudes. Observations were performed by using a CCD-based photometer over 2016 December to 2017 March. The main objective of our study is to determine a possibility of using a CCD camera to record fast optical flashes, and check a capability to separate signals from satellites, meteors, ground lightning discharges, etc. We describe automatic algorithms to select a frame with a flash and to identify the flash type. Based on the primary database of flashes, a preliminary statistical analysis of the results of observations was performed.