Evaluating solar flux proxies for thermospheric neutral density variability with a 30-year satellite drag database

Details Evaluating solar flux proxies for thermospheric neutral density variability with a 30-year satellite drag database Evaluating solar flux proxies for thermospheric neutral density variability with a 30-year satellite drag database

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa31a..11w&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA31A-11

Computer Science

Performance

0325 Evolution Of The Atmosphere, 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition, 1600 Global Change, 1650 Solar Variability

Scientific paper

Deficiencies in empirical neutral density models used for satellite drag have persisted at about the 15% one-sigma level. The error sources arise mainly due to inadequacies of the F10.7 proxy index for solar EUV heating. We examine the accuracy of newer proxies including the E10, Mg and Sol-C indices. These, indices are validated with a new, independent set of historic data derived for the period 1969-2000. The new database is generated from actual radar tracking observations, rather than from the less accurate historical element sets, to form precise orbit and drag/density data with improved accuracy and resolution. We use data from three satellites, all with perigee near 350 km, and with inclinations between 31 and 78 degrees to evaluate these proxies and our "effective F10 index" derived from the satellite drag measurements. The time history of density data is filtered to extract short term variations. Our measure of merit is the correlations coefficient between the short-term density variations and the various indices. A major emphasis is on analyzing performance of the indices as a function of solar activity over three solar cycles.

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