Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...44..373g&link_type=abstract
(IAU, American Astronomical Society, COSPAR, University of Hawaii, and NASA, Colloquium on the Satellites of Jupiter, 5th, Kailu
Astronomy and Astrophysics
Astronomy
24
Amalthea, Chemical Composition, Planetary Composition, Satellite Surfaces, Albedo, Allotropy, Glass, Io, Micrometeoroids, Silicates, Spectral Reflectance, Sulfur Compounds, Surface Properties
Scientific paper
It is proposed that charged particles from the Jovian magnetosphere, contaminants such as sulfur from Io, and high-velocity micrometeoritic matter, combine to darken, redden, and alter the surface of Amalthea revealed by Voyager; whose few isolated bright spots have a distinct greenish spectrum. A major finding of this analysis is that available spectral reflectance data contain little information about the bulk composition of the satellite. The effects of contamination by sulfur and its allotropes are shown to redden a variety of bulk compositions: carbonaceous material, refractory minerals, iron and iron sulfides, and moderate temperature silicates. The bright, greenish spots probably identify locations in which atypical alteration processes occur, such as variations in the amount of contaminant sulfur in micrometeoritic glasses or in the relative abundances of certain sulfur allotropes.
Gradie Jonathan
Thomas Patrick
Veverka Joe
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