Computer Science – Sound
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4565d&link_type=abstract
Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4565-4569.
Computer Science
Sound
Density Distribution, Ionospheric Composition, Ionospheric Temperature, Oxygen Afterglow, Temperature Gradients, Atmospheric Composition, Atmospheric Models, Atom Concentration, Latitude, Nightglow, Pitot Tubes, Temperature Measurement, Temperature Profiles, Turbulent Diffusion
Scientific paper
Oxygen density profiles inferred from Ogo 6 green nightglow emission vary too sharply between 100 and 120 km to be consistent with temperature gradients in standard model atmospheres, and the eddy diffusion coefficient K determined from these observations reaches its maximum below 115 km. For three atomic oxygen profiles obtained at geographic latitudes of -27.69, +48.89, and +59.10 the temperature profiles required to create a downward flux that varies with altitude as the integrated photolytic production rate above that altitude are calculated, assuming K to be invariant with altitude and latitude. The oxygen distribution can be reconciled with a constant eddy coefficient above 100 km if the temperature gradient reaches a value between 10 and 20 deg K/km for low values of the eddy coefficient (about 500,000 sq cm/sec) or between 30 and 50 deg K/km for a higher eddy coefficient (about 1.6 million sq cm/sec). The maximum gradient for the Jacchia (1971) model is about 10 deg K/km. These temperature profiles predict Ar/N ratios consistent with those measured by sounding rockets. The low K profiles are large enough to remove a large part of the solar energy deposited below 120 km by thermal conduction.
Carignan George R.
Donahue Thomas M.
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