Mars Radar Reflectivity - Focus on South Polar Regions

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The opposition of Mars in 2003 provided a fantastic opportunity to use the combined Goldstone/VLA radar to probe the surface with the highest resolution ever obtained on Mars with that instrument (as good as 70 km). Observations were made on August 11, 19, 28, and September 8. We will present results from the first three of these epochs, including results related to volcanic regions (Tharsis and Elysium), "Stealths", and the south polar residual and seasonal ice caps. The south polar residual ice cap is a very bright reflector, as seen previously, but we now also see a very bright reflection from the seasonal cap, not seen previously. The cap is not uniformly bright, however, and the extent of the bright reflection does not correspond to that expected either from albedo or thermal emission measurements. The reflective region does retreat with time as expected grossly, but there are significant differences, which will be presented and discussed. The NRAO is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc.

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