Abstract: No abstact available.

Abstract: Important contributions to the ?5577 dayglow may be made by dissociative recombination of O2+ and by photodissociation of O2 Both contributions are evaluated for a range of models corresponding to the uncertainties in the ...

Abstract: The runaway greenhouse effect provides the most plausible explanation for the divergent evolution of the atmospheres of Venus and Earth. It has not yet been convincingly demonstrated that the atmosphere of Venus is in ...

Abstract: It is argued from the observations of the red line that the rate coefficient for deactivation of the excited oxygen atoms in collisions with molecular oxygen cannot be much less than 10?10 cm3 sec?1 and that the solar flux ...

Abstract: We present a simple analytic model of the upper atmosphere which gives the composition, density, and temperature of the neutral atmosphere, as a function of altitude, for a wide range of conditions at the reference altitude ...

Abstract: Biological evolution, in its early stages, may have been constrained by the solar ultraviolet radiation that would have penetrated to the ground if the atmosphere at this time contained little or no oxygen and therefore ...