Thermospheric global average density trends, 1967-2007, derived from orbits of 5000 near-Earth objects

Details Thermospheric global average density trends, 1967-2007, derived from orbits of 5000 near-Earth objects Thermospheric global average density trends, 1967-2007, derived from orbits of 5000 near-Earth objects

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3505101e&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 5, CiteID L05101

Physics

Plasma Physics

27

Global Change: Atmosphere (0315, 0325), Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry, Atmospheric Composition And Structure: Pressure, Density, And Temperature, Space Plasma Physics: Spacecraft/Atmosphere Interactions

Scientific paper

We use orbit data on ~5000 near-Earth space objects to investigate long-term trends in thermospheric total mass density, which has been predicted to decrease with time due to increasing CO2 concentrations. We refine and extend to 2007 previous density trend estimates, and investigate solar cycle-dependent bias in empirical density models previously used to filter out solar irradiance effects. We find that the bias is caused in part by the solar cycle dependence of the long-term trends, and we develop a new representation of solar cycle, seasonal, and geomagnetic activity effects. At 400 km, we estimate an overall trend of -2.68 +/- 0.49 % per decade and trends of ~-5 and -2 % per decade at solar minimum and maximum, respectively, in fair quantitative agreement with theoretical predictions. The global average density trends also depend on the phase of the year, with the strongest trends around October and weak trends in January.

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