The longitudinal variation of the thermal inertia and of the 2.8 centimeter brightness temperature of Mars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Brightness Temperature, Mars Surface, Planetary Radiation, Planetary Temperature, Temperature Distribution, Centimeter Waves, Particle Size Distribution, Space Observations (From Earth), Spatial Distribution, Surface Temperature, Temperature Measurement, Mars, Brightness Temperature, Thermal Effects, Radiometry, Albedo, Data, Longitude, Surface, Dust, Observations, Models, Comparisons, Irtm, Distribution, Thermal Properties, Mapping

Scientific paper

The spatial variations on Mars of the surface thermal inertia and radiometric albedo are used to predict the variation with sub-earth longitude of the 2.8 cm whole-disk brightness temperature. The maximum variation predicted, about 8 K, agrees well with observations. The sub-earth longitudes at which the temperature maxima and minima are predicted to occur nearly agree with the observations. There are, however, differences in the overall form of the variation with longitude. These discrepancies can be reduced by an ad hoc assumption of spatial variations in either the fraction of the surface covered by rock or the amount of atmospheric dust.

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