A model of thermospheric temperature and composition

Computer Science – Sound

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Atmospheric Composition, Atmospheric Models, Atmospheric Temperature, Thermosphere, Annual Variations, Argon, Diurnal Variations, Helium, Hydrogen, Nitrogen, Oxygen, Satellite Sounding

Scientific paper

An empirical model of thermospheric temperature (T/infinity/, T120, and s) and composition (H, He, N, O, N2, O2, and Ar) was derived from measurements of 8 satellites and 4 incoherent scatter stations. The altitude covered extends from 120 km up to about 600 km over the time period 1967 to 1976. The analytical framework used in the model resembles closely the MSIS setup; time independent terms, solar flux terms, geomagnetic activity (Kp) effect, annual (semiannual) and diurnal (semidiurnal, terdiurnal) variations, longitudinal terms, the UT effect, and corrections compensating for deviations from diffusive equilibrium at altitudes below 200 km. The model describes quiet to medium disturbed geomagnetic conditions at solar fluxes (10.7 cm) ranging from 60 to 180 x 10 to the -22nd/sq Wm Hz.

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