Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rpspr...9...32g&link_type=abstract
In its USSR Rept.: Space (JPRS-USP-85-004) p 32 (SEE N85-26772 16-12) Transl. into ENGLISH from Pisma v Astron. Zh. (Moscow),
Astronomy and Astrophysics
Astronomy
Cooling, Infrared Radiation, Low Temperature, Night, Thermosphere, Venus Atmosphere, Atmospheric Models, Carbon Dioxide, Carbon Monoxide, Oxygen, Venus (Planet), Water
Scientific paper
Anomalously low temperatures of the Venusian nighttime thermosphere were discovered but have not been theoretically explained. This temperature in the neighborhood of the antisolar point decreases with altitude from approximately 170 K at 100 km to 100-130 K in the exosphere region at 150-160 km. Such a temperature profile was not predicted in any theoretical model. The Venusian nighttime thermosphere is not a region with increased temperatures and a positive vertical temperature gradient, but is in actuality a cryosphere. No efforts have been made to explain this phenomenon. A mechanism is proposed for explaining the exceedingly low temperatures of the Venusian nighttime upper atmosphere: cooling by IR radiation in the rotational band of H20 molecules. the phenomenon was quantitatively described using a theoretical model which in the altitude range 100-170 km in the neighborhood of the antisolar point made it possible to compute the vertical profiles of temperature and the CO2, CO, 0 and H20 concentrations.
Gordiyets B. G.
Kulikov Yu. N.
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