A global reference atmospheric model for surface to orbital altitudes

Computer Science

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Atmospheric Circulation, Atmospheric Models, Global Atmospheric Research Program, Reference Atmospheres, Atmospheric Density, Atmospheric Temperature, Computer Programs, Isobars (Pressure), Markov Chains, Periodic Variations, Reentry Trajectories, Statistical Distributions, Synoptic Meteorology, Wind Variations

Scientific paper

An empirical atmospheric model has been developed which generates values for pressure, density, temperature and winds from surface levels to orbital altitudes. The output parameters consist of components for: (1) latitude, longitude, and altitude dependent monthly means; (2) quasi-biennial oscillations; and (3) random perturbations to partially simulate the variability due to synoptic, diurnal, planetary wave and gravity wave variations. The monthly mean models consist of: NASA's four dimensional worldwide model for height, latitude, and longitude dependent monthly means from the surface to 25 km; and a newly developed latitude-longitude dependent model which is an extension of the Groves latitude dependent model for the region between 25 and 90 km. The Jacchia 1970 model is used above 90 km and is faired with the modified Groves values between 90 and 115 km. Quasi-biennial and random variation perturbations are computed from parameters determined from various empirical studies, and are added to the monthly mean values.

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