New Applications for the Jacchia 77 Model

Details New Applications for the Jacchia 77 Model New Applications for the Jacchia 77 Model

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1538w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1538

Physics

0358 Thermosphere: Energy Deposition (3369), 0466 Modeling, 3369 Thermospheric Dynamics (0358), 7969 Satellite Drag (1241)

Scientific paper

We examine the Jacchia 77 model and compare model densities to the 2001-2005 densities derived from the CHAMP and GRACE accelerometer data. Of particular interest is the model's unique formulation of exospheric temperature directly from the solar flux (F10) as opposed to a nighttime minimum temperature in the earlier Jacchia 70 and Jacchia 71 models. We compare this calculation directly to average global exospheric temperatures derived from the CHAMP and GRACE accelerometer neutral density data using the hydrostatic equation. The average global exospheric temperature is important because the model density profiles are all derived from this quantity. The Jacchia 77 model includes a special 81-day weight averaged F10 as a model proxy. This approach uses the F10 from the last three solar rotations instead of a centered F81 index, which means the model can be used in real time by using an 81-day weighted "boxcar" index. With new solar proxies for EUV and Mg recently introduced, we discuss the possibility of incorporating these indices in a similar manner. Because the drivers of thermospheric density-- the semiannual variation, solar EUV and solar wind are treated as separate modules in the model-- we examine the strengths and weaknesses of each one as consideration for future model upgrades.

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