Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...65..129n&link_type=abstract
Icarus (ISSN 0019-1035), vol. 65, Jan. 1986, p. 129-151.
Astronomy and Astrophysics
Astronomy
36
Europa, Planetary Geology, Planetary Mapping, Satellite Surfaces, Albedo, Galilean Satellites, Jupiter Atmosphere, Multispectral Band Scanners, Optical Properties, Spaceborne Astronomy, Spectrum Analysis, Surface Properties, Voyager Project, Jupiter, Satellites, Europa, Surface, Features, Optical Properties, Maps, Spectra, Voyager Spacecraft, Imagery, Symmetry, Ultraviolet, Wavelengths, Ions, Albedo, Exogenic Effects, Bombardment, Magnetosphere, Alteration
Scientific paper
The Voyager global multispectral mosaic for the Galilean satellite Europa (T. V. Johnson et al., 1983) was analyzed to map surface units with similar optical properties (T. B. McCord et al., 1982). Color assignments in the unit map are indicative of the spectral nature of the unit. The unit maps make it possible to infer extensions of the geologic units mapped by B. K. Lucchitta and L. A. Soderblom (1982) beyond the region covered in the high-resolution imagery. The most striking feature in the unit maps is a strong hemispheric asymmetry. It is seen most clearly in the ultraviolet/violet albedo ratio image. It appears as if the surface has been darkened, essentially as the cosine of the angle from the antapex of motion. The cosine pattern suggests that the darkening is exogenic in origin and is interpreted as evidence of alteration of the surface by ion bombardment from the Jovian magnetosphere.
Clark Roger Nelson
Johnson Torrence V.
Matson Dennis L.
McCord Th. B.
Mosher Joel A.
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