Mathematics – Logic
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...85..335o&link_type=abstract
Icarus (ISSN 0019-1035), vol. 85, June 1990, p. 335-345.
Mathematics
Logic
27
Callisto, Europa, Ganymede, Planetary Geology, Radar Echoes, Radar Geology, Electromagnetic Scattering, Galilean Satellites, Radar Signatures, Refractivity, Jupiter, Satellites, Europa, Ganymede, Callisto, Radar Methods, Ice, Icy Bodies, Electromagnetic Effects, Scattering, Regolith, Hypotheses, Thickness, Thermal History, Age Dating, Geology, Ejecta, Refraction, Diagrams, Annealing, Heterogeneity
Scientific paper
Electromagnetic echo-scattering models, empirical and theoretical considerations on regolith formation, and ice physics, are presently invoked in a geologic treatment of the anomalous radar properties of the icy Galilean satellites. These are held to arise because of the electrical differences between ice and silicates, and the absence of icy regoliths' ice-density structures in silicate regoliths. Icy regoliths may uniquely smooth out discontinuities between solid ejecta fragments and more porous surroundings, forming refraction-scattering 'lenses'; high-order multiple scatterings will thereby become more likely responsible for the echoes than low-order scattering.
Ostro Steven J.
Shoemaker Eugene M.
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