Mathematics – Logic
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.3010g&link_type=abstract
American Astronomical Society, DPS meeting #38, #30.10; Bulletin of the American Astronomical Society, Vol. 38, p.539
Mathematics
Logic
Scientific paper
The intricate pattern of geological features on the surface of Europa, with its lattice of interwoven lineaments and chaotic terrain, is accentuated by the ruddy materials concentrated along these features. Varying from the ubiquitous signature of ice which comprises the remainder of the surface of this moon, these materials show close spectral matches with sulfur-bearing salts and have been hypothesized to indicate sites where communication with a subsurface ocean has occurred. Representing as they may the only remote clue as to the composition and consequent habitability of this subsurface ocean, further constraints on the nature of these materials are required.
The opportunity to evaluate and refine our abilities to successfully identify sulfur compounds on ice by means of orbital remote sensing techniques has arisen in the form of a terrestrial field site in the Canadian High Arctic. Borup Fiord Pass is home to a glacier onto which sulfur-rich springs discharge, leading to the formation of extensive deposits of elemental sulfur and gypsum such as those observed in the 2006 field season. Our investigations revealed an area of ice many hundred meters squared onto which outflow from channels, likely active at various stages over the winter, had produced a buildup of yellow to brown sulfur-rich materials. Spectral reflectance measurements obtained in the field of these sulfur-rich deposits will be utilized as spectral endmembers for subpixel analysis of Hyperion hyperspectral data obtained in a similar timeframe. Data on the relationship between spectral signatures from orbit and their appearance in the field will allow us to return to the Europa dataset to improve on our knowledge of the composition of the materials present there.
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