Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..633g&link_type=abstract
Geophysical Research Letters, vol. 8, June 1981, p. 633-636. Research supported by the Fonds National de la Recherche Scientifi
Astronomy and Astrophysics
Astronomy
28
Nightglow, Nitric Oxide, Thermosphere, Transport Properties, Ultraviolet Spectroscopy, Venus Atmosphere, Diffusion Coefficient, Pioneer Venus Spacecraft, Spaceborne Astronomy, Vertical Distribution, Venus, Altitude, Distribution, Ultraviolet, Wavelengths, Nightglow, Vertical Transport, Nitric Oxide, Spectrometer, Pioneer Venus, Data, Data Reduction, Analysis, Diffusion, Layering, Observations, Hydrodynamics, Carbon Dioxide
Scientific paper
The altitude distribution of the nitric oxide nightglow was measured with an ultraviolet spectrometer on board Pioneer Venus, in order to study the effects of the distribution on the Venus nightside lower thermosphere transport properties. Limb profiles were obtained with an 8 ms integration period on several orbits near periapsis. The observations were made between P minus 2 min and P plus 4 min, where altitude ranges between 150 and 350 km, and latitude varies from 24 degrees N to 9 degrees S. A method independent of the spacecraft attitude data was used to fit the observed limb profiles, and to find the altitude of the maximum of the layer (115 plus or minus 2 km), and the topside scale height (about 3 km). It is shown that downward transport by diffusion alone is not sufficient, and if vertical motion is parameterized by eddy diffusion, an eddy diffusion coefficient is deduced from the altitude of the layer.
Bougher Stephen W.
Gérard Jean-Claude
Stewart Ian F. A.
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