Measurements of upper mesosphere temperature on the height of night sky emission excitation OH and O2(0-1) in Yakutsk

摘要

The results of the hydroxyl and oxygen molecules rotational temperature measured during two observational seasons 1999-2001 in Maymaga station (φ=63°N; λ=129.50°E) are presented. It is shown that the amplitude of seasonal variation of hydroxyl rotational temperature is greater than the molecular oxygen variation. OH temperatures have been systematically higher the O_2 ones during winter. The abrupt decreasing of the O_2 intensity connected with the springtime transition of the atmospheric circulation process is found in both time series. In first time a change of the temperature vertical gradient sign caused by the mesopause height shifting to the more high (winter) level was shown in the data of August-September 2001. Comparisons of night airglow variations with stratospheric temperature over Yakutsk at the 10 mb height, averaged over the polar cap (latitudes of ≥65°N), is presented. The waves registered in mesosphere by variation of molecular oxygen emission rate are of periods up to ten days, and the envelope of their amplitudes is similar to stratosphere temperature oscillations with a time scale o f approximately 30 days. Such a close association of two different p arameters in the a tmosphere r egions separated in height c an be e xplained by p assage o f large-scale wave disturbances through them.