Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1562m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1562
Mathematics
Logic
0350 Pressure, Density, And Temperature, 0358 Thermosphere: Energy Deposition (3369), 1600 Global Change, 7959 Models, 7969 Satellite Drag (1241)
Scientific paper
Satellite drag measurements have permitted detection of long-term changes in thermospheric density. The effect is most pronounced during solar minimum conditions. We have extended our previous database of thermospheric densities deduced from satellite drag data back to 1962 to capture the solar minimum period in 1964-1965 and through the solar minimum into 2008 to cover five solar minima for the first time. All data are generated from actual radar tracking observations to form precise orbit and drag/density data with improved accuracy and one-day resolution. Satellites with relatively high eccentricities were used to achieve long lifetimes and relatively localized latitude and local time resolution. Trends are presented as ratios to the empirical neutral density models. The model representations have also been enhanced by replacing their climatological average semiannual variations with realistic values derived for each satellite. This analysis permits accurate representation of thermospheric cooling as a function of solar flux. In qualitative agreement with theoretical models, the cooling is sensitive to solar cycle with the largest changes occurring at solar minimum. Trends are also deduced for the first time in terms of thermospheric temperature changes. The derived thermospheric cooling is further analyzed as a function of altitude (250-550 km), latitude, season, local time, solar flux and geomagnetic activity. Results are compared to both empirical and theoretical model predictions.
Bowman Bruce R.
Delay S. H.
Grossbard Neil J.
Marcos Frank A.
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