LONG-TERM VARIATIONS OF TEMPERATURE AND STRUCTURE OF THE MIDDLE ATMOSPHERE WITHIN THE LAST CENTURY

On the basis of the long-term data about the mesopause temperature (1955-2005) obtained by photometric of hydroxyl and atomic oxygen emissions and the analysis of data of the rocket and ionospheric temperature measurements of the atmosphere the distributions with height of temperatures have been constructed. They have allowed us to reveal the cooling of the middle and the upper atmosphere. For the mesopause region (~87 km) the tendency of long-term change of temperature has a non-linear character. The values of the temperature long- term trend for temporal intervals from 1955 up to 1990 and from 1990 up to present are -(0.7) K·year -1 and - (0.2÷0) K·year -1 , respectively.