Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...56..465e&link_type=abstract
Icarus (ISSN 0019-1035), vol. 56, Dec. 1983, p. 465-475.
Astronomy and Astrophysics
Astronomy
9
Brightness Temperature, Mars Surface, Radio Astronomy, Surface Properties, Centimeter Waves, Millimeter Waves, Planetology
Scientific paper
Extensive 3.5-mm measurements are reported which show a variation in the brightness temperature of Mars, with the Central Meridian Longitude that is generally in phase with the variation at 2.8 cm and is opposite in sign from the variations at 20 microns. It is pointed out that the phase result is not unexpected, since 3.5 mm is longer than the wavelength at which the phase behavior is expected to change. The result that the 3.5-mm rotation curve amplitude is larger than the amplitudes at both 20 microns and 2.8 cm, however, is unexpected. This result, it is noted, can be explained as a consequence of subsurface scattering from rocks smaller than 1.5 cm in radius. A correlation of subsurface scatterers with the location of the high-thermal inertial regions would be consistent with the hypothesis that rock abundance predominates in determining the thermal inertia.
Andrew Bryan H.
Briggs Frank H.
Epstein Eugene E.
Jakosky Bruce M.
Palluconi F. D.
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