Crystalline and Amorphous ice as Markers for Activity on Satellites

Details Crystalline and Amorphous ice as Markers for Activity on Satellites Crystalline and Amorphous ice as Markers for Activity on Satellites

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p32a..06b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P32A-06

Other

6020 Ices, 6207 Comparative Planetology, 6221 Europa, 6280 Saturnian Satellites

Scientific paper

The degree of crystallinity in water ice can be used to search for regions of recent activity on satellites. Amorphous ice forms when water vapor condenses at temperatures below 100 K. If water ice is heated to temperatures greater than 150 K, it assumes the crystalline form. Although this transition is irreversible, bombardment of crystalline ice by high-energy particles can destroy the crystalline structure and convert the ice to its amorphous form. Thus, the degree of crystallinity on icy satellites that are in planetary magnetospheres can be used as a marker for recent activity that involves heating above 150 K. The size and position of water ice bands in the near IR, particularly those at 1.65 and 3.1 microns, have been used to detect regions of activity on Enceladus (Brown et al., 2006, Science 311, p. 1425) and to map crystallinity on Europa (Hansen et al., 2004, J.G.R. Planets 109, p. 1012). These techniques have been applied to seek regions of possible activity on other icy satellites. This work was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under contract to the National Aeronautics and Space Administration.

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