Structure of ices on satellites

Details Structure of ices on satellites Structure of ices on satellites

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...58..282s&link_type=abstract

(IAU, COSPAR, NASA, et al., Colloquium on Natural Satellites, 77th, Cornell University, Ithaca, NY, July 5-9, 1983) Icarus (ISSN

Physics

14

Comet Nuclei, Densification, Ice, Satellite Surfaces, Carbon Dioxide, Icy Satellites, Meteoritic Damage, Porosity, Temperature Gradients, Planets, Satellites, Ice, Structure, Meteorites, Micrometeorites, Bombardment, Density, Formation, Crystals, Temperature, Pressure, Thermal Effects, Porosity, Depth, Creep, Deformation, Diffusion, Matrix, Gradients, Size, Distribution, Analysis, Carbon Dioxide, Water, Physical Properties, Calculations, Data, Comets

Scientific paper

The pressure densification of ices, in combination with density changes induced by pore migration in a thermal gradient and the phase transitions of water due to meteoritic bombardment (into either high pressure polymorphs or an amorphous phase) create a complex situation, which is not easily evaluated in either satellites or cometary nuclei. Accordingly, the present findings concerning solar system satellites and comets cannot be rendered quantitative. In general, due to insolation, icy satellites may have slightly warmer surfaces than their interiors. If there are CO2 ice inclusions in satellite water ices, they would have diffused as vapor along pores toward the cold interiors or, if near the surface, would have evaporated. The presence of pores and amorphous ice in cometary nuclei has an important effect on their flare-up and the size of the comas and tails.

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