Photometry of Venus: II. Theoretical brightness distribution over the disk |
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| Authors: | C Bigourd C Devaux M Herman J Lenoble |
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| Institution: | Laboratoire d''Optique Atmosphérique, Universitédes Sciences et Techniques de Lille, France |
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| Abstract: | Theoretical brightness distributions over the Venus disk have been computed for homogeneous and multilayered cloud models. With homogeneous models, the relative brightness does not depend very much on the optical properties of the cloud, except near the limb or for small phase angles. For multilayered cloud structures, the relative brightness is nearly fixed by the structures and the relative brightness is nearly fixed by the scattering function of the uppermost cloud; the vertical distribution of the absorption is unimportant if the spherical albedo of the planet is given. If the horizontal inhomogeneities currently seen on Venus are due to a layered structure, with an optical thickness of the upper cloud varying from point to point, large simplifications seem possible, and measured contrasts at various wavelengths should permit a test of such a model. |
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