Abstract
The problem of determination of trends in thermospheric dynamics parameters (horizontal winds) on the basis of analysis of trends in various combinations of ionospheric F2-layer parameters is formulated. The previous attempts of the author in this direction are briefly described. It is shown that all studied parameters lead to the same result: after the “boundary date” (approximately 1980) a systematic change in these parameters (a long-term trend) is observed, this fact manifesting changes in the dynamical regime of the thermosphere because of cooling and contraction of the entire middle and upper atmosphere. The results of a search for trends in the hmF2 height for the moment (Т(ss) + 2h) are described. These trends are found higher than the hmF2 trends obtained earlier by various authors analyzing the hmF2 behavior at fixed moments of local time.
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