Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13a0261m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA13A-0261
Physics
0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 1610 Atmosphere (0315, 0325), 7959 Models, 7969 Satellite Drag (1241)
Scientific paper
Empirical models of thermospheric total mass density have been available since the early 1960's for scientific analyses and for predicting satellite drag. Historically, model accuracies have been essentially constant despite an increasing measurement database. The Jacchia Bowman 2006 (JB2006) model has demonstrated the first significant accuracy improvement in thermospheric modeling. Densities predicted by the new JB2006 empirical model are compared to those from the NASA MET, NRLMSIS, Jacchia 1970 and DTM models. Models are evaluated using two complementary neutral density data sets. One set consists of unique high- accuracy thermospheric neutral densities with one-day resolution obtained from tracking of 38 satellites with perigees between 225 and 600 km. These data, from 1997-2004, cover almost a solar cycle. Comparisons are also made near 400 km altitude using high-resolution CHAMP accelerometer densities covering the period June through September for years 2002-2004. Ratios of data to model are analyzed vs altitude, latitude, local time, day of year and solar and geomagnetic conditions. Model accuracy enhancements resulting from the JB2006 new solar flux, semiannual and local time model formulations are emphasized.
Bowman Bruce R.
Marcos Frank A.
Sheehan R. E.
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