Physics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop..445m&link_type=abstract
NOAO Proposal ID #2003A-0445
Physics
Scientific paper
At the low temperatures found on the surfaces of icy solar system bodies, water ice has two predominant phases: crystalline and amorphous (or glassy). The amorphous to crystalline phase transition at 140 K is one directional, such that the phase of the ice can tell the observer about the temperature history of an object's surface. These two phases have distinct infrared absorptions, and can be differentiated based on H- band spectrophotometry. High radiation environments can cause crystalline ice to look like amorphous, thus destroying the temperature history. Water ice has been detected on the surface of Europa by ground based observation and by the Galileo spacecraft. We have simulated the process of destroying a crystalline water ice lattice while re- crystallization occurs due to its temperature. Through a combination of theoretical results and observations of Europa, we propose to make estimates for the age or temperature of the surface based on the presence of crystalline ice.
Brown Robert
Emery Josh
Mastrapa Rachel
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