Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0219i&link_type=abstract
American Astronomical Society, DPS meeting #28, #02.19; Bulletin of the American Astronomical Society, Vol. 28, p.1062
Astronomy and Astrophysics
Astronomy
Scientific paper
We observed Mars with the Very Large Array (VLA) on two nights in 1990 and 1995 during opposition. Operating at the wavelength of 1.35 cm (22 GHz), we mapped the thermal emission from the Martian surface. A thermal model of Martian subsurface temperatures was used to fit apparent dielectric constant values to the observed surface brightness temperature variations. We were then able to map emissivity for the Tharsis and Amazonis Planitia regions of Mars. The results reveal a region with anomalously high values of emissivity (low dielectric constant). This region lies within the contour of the Stealth feature, discovered by Muhleman's radar group in 1991. Based on the results of passive and active radar experiments, we interpret Stealth as a region of low density near the surface. The effective depth of passive probing is just several wavelengths (10-15cm), even shallower than the radar result. The lowest estimate of density, derived from the emissivity is 0.4 g/cm(3) . We think that this region is formed by some underdense material, like ash or pumice and is associated with volcanic activity of the nearby Tharsis volcanoes.
Ivanov Anatoly A.
Muhleman Duane
Vasavada Ashwin
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