Grain-size determination at the surface of Mars

Details Grain-size determination at the surface of Mars Grain-size determination at the surface of Mars

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...67...37d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 67, July 1986, p. 37-50.

Physics

12

Grain Size, Mars Surface, Particle Size Distribution, Polarimetry, Soil Mechanics, Mars 5 Spacecraft, Thermal Mapping

Scientific paper

Photopolarimetry data from remote sensing instrumentation on the Soviet Mars-5 spacecraft were used to assess the average grain sizes of the Martian surface. The grain sizes are determined because the degree of polarization of the light scattered from the surface is in large part controlled by the sizes of the resident particulate matter. The data support an average grain size of 20-45 microns over much of the Martian surface. Radiometers on the Mars-5 and Viking spacecraft indicate that these fines have a low thermal inertia. Several regions are also described, such as at crater rims, where abrupt increases in the degree of polarization suggest that bare rock swept clean by wind lies exposed.

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