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Published on: June 28, 2018
Summer evolution of the north polar cap of Mars as observed by OMEGA/Mars Express
Y Langevin1, F Poulet, J-P Bibring
1Institut d'Astrophysique Spatiale, CNRS-Université Paris Sud, 91405 Orsay, France. yves.langevin@ias.u-psud.fr
Abstract:
The Observatoire pour la Minéralogie, l'Eau, les Glaces, et l'Activité (OMEGA) visible-infrared imaging spectrometer extensively observed regions of Mars with latitudes above 70 degrees N in late 2004 (heliocentric longitude from Ls 93 degrees to Ls 127 degrees ). The extent of water ice at the surface and the size of ice grains were monitored as a function of time. Bright, small-grained frost, which initially covered a large fraction of the polar cap, waned in favor of large-grained ice. In outlying regions, dominated by large-grained ice, the albedo increased over the period. Evaluating the dust content was model dependent. However, contamination of ice by dust was low.
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