A thermospheric model of the annual variations of He, N, O, N2, and Ar from the Aeros Nims data

Details A thermospheric model of the annual variations of He, N, O, N2, and Ar from the Aeros Nims data A thermospheric model of the annual variations of He, N, O, N2, and Ar from the Aeros Nims data

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4355k&link_type=abstract

Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4355-4362. Bundesministerium für Forschung und Technologie

Physics

3

Annual Variations, Atmospheric Composition, Mass Spectroscopy, Nitrides, Thermosphere, Aeros Satellite, Argon, Atmospheric Models, Exosphere, Gas Density, Helium, Latitude, Nitrogen, Ogo-6, Oxygen, Spherical Harmonics

Scientific paper

A model of the annual variations of He, N, O, N2, and Ar was derived from the Aeros A and Aeros B neutral and ion mass spectrometer (Nims) data at two local times, 4 and 16 hours, in the altitude range 220-550 km. The Aeros data represent conditions near a solar minimum during the period December 1972 to September 1975. Using the analytical framework of the Ogo 6 model, the number densities of the constituents were expanded into spherical harmonics and the temperature inferred from N2 observations under the assumption of diffusive equilibrium. The average exospheric temperature 835 K is in excellent agreement with Thuillier's model value of 840 K but lies about 20 K above the corresponding temperature of the MSIS model. The familiar constituents He, O, N2, and Ar were extended by atomic nitrogen which was deduced from the 30-amu mass peak. At the poles this constituent shows a density pattern similar to N2 and at the equator like O, but with a much stronger diurnal variation.

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