Mars spectrophotometry in the KRFM experiment (Phobos) - Some properties of atmospheric aerosol and surface particles

Statistics – Computation

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Mars Atmosphere, Aerosols, Atmospheric Composition, Space Missions, Brightness Distribution, Surface Properties, Spectrophotometry, Infrared Radiometers

Scientific paper

Results of a new analysis of the data of the KRFM (Phobos) experiment are reported. All five of the available full photometric profiles (eight wavelengths each) have been processed, and model computation methods and calibrations have been updated. The optical thickness of the constant haze is estimated to be in the range 0.1-0.2, much smaller than that predicted from the Viking data. The imaginary part of the refraction index of the constant haze particles varies continuously from 0.015 at a wavelength of 315 nm to 0.005 at 550 nm, which corresponds to a basalt material containing several percent of iron oxides. The clouds over large volcanoes have an optical thickness of about 0.1 and contain 5 x 10 exp -6 g/sq cm ice particles. The mean radius of the optically active particles of the soil is estimated at 6-7 microns.

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