Measurements of the flux of sunlight in the atmosphere of Venus

Computer Science – Sound

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Venus, Atmosphere, Flux, Solar Radiation, Pvm Mission, Lsfr Instrument, Intensity, Altitude, Optical Properties, Depth, Clouds, Lcps Instrument, Particles, Size, Absorption, Techniques, Models, Structure, Thickness, Calibrations, Calculations

Scientific paper

The solar flux radiometer aboard the Pioneer Venus sounder probe measured sunlight intensity in five directions to the vertical using narrow angular fields of view. Measurements in a narrow spectral channel (0.59-0.67 micron) and two broad channels (0.4-1.0 and 0.4-1.8 microns) were reduced to yield the profiles of upward and downward solar flux with a vertical resolution of 100-500 m. All the flux profiles show three distinct cloud layers with bottoms at 57.5, 49.7, and 47.9 km. The azimuthal structure of the intensity samples at the highest altitudes implies a cloud optical depth between 3.5 and 4.0 above 64.3 km. The narrowband data were interpreted to give optical depths and single-scattering albedos of the clouds at a wavelength of 0.63 micron.

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