Exospheric temperature formulation for use in atmospheric density models based on new data and proxies

Details Exospheric temperature formulation for use in atmospheric density models based on new data and proxies Exospheric temperature formulation for use in atmospheric density models based on new data and proxies

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21a0419t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA21A-0419

Physics

2447 Modeling And Forecasting, 2722 Forecasting, 2753 Numerical Modeling, 7819 Experimental And Mathematical Techniques

Scientific paper

The exospheric temperature for the Earth's upper atmosphere is often specified by an empirical formulation for Jacchia-type neutral thermosphere density models. The Jacchia 1970 model, for example, uses an equation that was derived from a relationship between the 10.7 cm solar radio flux (F10.7) and observed satellite drag nearly 40 years ago. F10.7 is representative of solar coronal emissions. In the last few years, advances in two separate areas have converged to provide an enormous step forward in exospheric temperature/thermospheric density specification. First, information on the long term orbit evolution of a few key satellites over several solar cycles became available. Second, the E10.7 solar proxy, representative of both chromospheric and coronal solar emissions, was developed and compared with the F10.7 proxy for use in specifying exospheric temperatures. Out of the combination of these two activities has emerged a new formulation of the Jacchia 1970 exospheric temperature equation that uses daily E10.7 and an 81-day averaged F10.7 to provide thermospheric densities significantly improved from those provided by the original Jacchia 1970 temperature equation. The comparison of the new temperature formulation with the older version is presented and the significance of this new technique for better understanding, describing, and predicting the space environment is discussed.

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