Abstract
The analysis of changes in temperature of mesopause region based on fluctuation measurements of rotational temperature and intensity of molecular emission of hydroxyl OH (6,2) excited at ~87 km altitude is presented. Observations were carried out at the Maimaga station (63°N, 129.5°E), at a distance of 150 km to the north from Yakutsk. Parameters of seasonal variation was defined based on the data received from 1999 to 2015. Measurements were conducted with a digital infrared spectrograph. The temperature was determined from the distribution of the emission intensity in the different branches of the molecular hydroxyl band. Data from the radiometer SABER v.2.0 installed on the satellite NASA TIMED was used in the research. 2320 midnight temperature values of hydroxyl OH (6,2) suitable for determining the parameters of the seasonal variation were obtained at the Maimaga station over 16 years of measurements. The seasonal temperature variations of mesopause region were investigated in the form of annual, semiannual and a terannual component. Annual harmonic variations range from 18.2K to 64.7K, and the semiannual harmonics range from 6.8K to 26.6K. The dependence of the annual and semiannual harmonics from the solar activity was detected. Probably the dependence indicates a strengthening of the circulation of the upper atmosphere during periods of maximum solar activity.
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