Estimation of secular density variations in the upper atmosphere from 1964-2007 satellite drag data

Details Estimation of secular density variations in the upper atmosphere from 1964-2007 satellite drag data Estimation of secular density variations in the upper atmosphere from 1964-2007 satellite drag data

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sosyr..45..420v&link_type=abstract

Solar System Research, Volume 45, Issue 5, pp.420-432

Computer Science

Scientific paper

Orbital parameters of several artificial satellites of the Earth were analyzed for 1964-2007 and secular variations of the atmospheric density were estimated for the last 30-40 years. The analysis was based on the information about orbital parameters of 17 satellites and high-precision numerical integrations of the equations of motion with allowance for basic perturbing factors and spatiotemporal density variations, calculated from measured solar activity indices using the NRLMSISE-00 atmosphere model. The results demonstrate the presence of long-term variations in the atmospheric density not presented in modern atmosphere models. During solar-activity cycle 21, the atmospheric density became 0.4 to 19% higher (depending on height) than in cycle 20. It decreased by 1.0 to 11% (depending on height) in cycle 22 as compared to cycle 21. Both decreases and increases were observed in the atmospheric density during cycle 23, but with much smaller gradients. The results cannot be explained only by the growing concentration of greenhouse gases. Possible causes of the density variations and possible ways to take them into account in modern empirical and semiempirical atmospheric models are discussed.

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