Parameters of the ionospheric F2 layer as a source of information on trends in thermospheric dynamics

The problem of determining trends in thermospheric dynamics parameters (horizontal winds) based on analysis of trends in various combinations of ionospheric F 2 -layer parameters is formulated. The previous attempts of the authors in this direction are briefly described. It is shown that all studied...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2010-04, Vol.50 (2), p.187-200
Main Authors: Danilov, A. D., Vanina-Dart, L. B.
Format: Article
Language:English
Subjects:
Atmospheric sciences
Earth and Environmental Science
Earth Sciences
Geophysics
Geophysics/Geodesy
Ionosphere
Trends
Upper atmosphere
Wind
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Summary:The problem of determining trends in thermospheric dynamics parameters (horizontal winds) based on analysis of trends in various combinations of ionospheric F 2 -layer parameters is formulated. The previous attempts of the authors 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 hmF 2 height for the moment ( T (ss) + 2 h) are described. These trends are found higher than the hmF 2 trends obtained earlier by various authors analyzing the hmF 2 behavior at fixed moments of local time.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793210020064