Abstract
Previous photometric and polarimetric observations of Venus have indicated the presence of a thin layer of small particles above the usual cloud layers. We sensed some characteristics of this upper layer on the basis of the Meudon and Pic-du-Midi regional polarization survey, covering from 1950 to 1972. Optical thicknesses of the order of several percent with particle radii of around 0.2 ..mu..m are indicated. The refraction index is not known. Although this layer is apparently globally permanent, variations occur regionally and with time.
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