Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa41a..11e&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SA41A-11
Physics
0355 Thermosphere: Composition And Chemistry, 0394 Instruments And Techniques, 3360 Remote Sensing
Scientific paper
We use TIMED/GUVI limb observations of thermospheric far UV dayglow to derive height profiles of O, N2, and O2 number densities. From these, we calculate the total mass density for comparison with total mass density derived from changes in the orbits of satellites with varying perigee heights. To accommodate sampling differences, we compare the ratio, averaged over ~3 days, of observed total mass density to that predicted by the NRLMSISE-00 empirical model. Our results represent the first validation of absolute densities derived from FUV limb scanning. The GUVI densities in the 300-500 km range are in good agreement with the orbit-derived densities, with both showing variations on solar rotation time scales. Of particular interest is a substantial depletion of upper thermospheric density around day 200 of 2002, when observed densities were 40% smaller than those predicted by NRLMSISE-00.
Emmert John T.
Lean Judith L.
Meier Robert R.
Picone Michael J.
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