Now showing items 21-26 of 26
Venus mesosphere and thermosphere : II. Global circulation, temperature, and density variations
(Elsevier, 1986-11)
Recent Pioneer Venus observations have prompted a return to comprehensive hydrodynamical modeling of the thermosphere of Venus. Our approach has been to reexamine the circulation and structure of the thermosphere using the ...
Ammonia photolysis and the greenhouse effect in the primordial atmosphere of the earth
(Elsevier, 1979-01)
Photochemical calculations indicate that in the prebiotic atmosphere of the Earth ammonia would have been irreversibly converted to N2 in less than 40 years if the ammonia surface mixing ratio were -4. However, if a ...
Observations of the J = 1-0 CO lines in the Mars atmosphere: Radiodetection of 13CO and monitoring of 12CO
(Elsevier, 1989-02)
Repeated millimeter-wave observations of Mars, performed in September and October 1986 and January 1987, allowed a high-resolution recording of the J = 1-0 12CO line, and the first radiodetection of 13CO. In the hypothesis ...
Water Production Rates in Comet P/Halley from IUE Observations of HI Lyman-[beta]
(Elsevier, 1993-10)
During the 1985-1986 apparition of Comet P/Halley, the International Ultraviolet Explorer (IUE) satellite observed the comet using both the long-wavelength and short-wavelength spectrographs. The combination of a spherical ...
Multiple scattering of light in a spherical cometary atmosphere with an axisymmetric dust jet
(Elsevier, 1992-08)
We have developed a numerical solution for the anisotropic multiple scattering of light in a cometary atmosphere. The atmosphere is assumed to be a spherical shell illuminated by parallel solar rays. The spatial variation ...