Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.8077m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, July 10, 1986, p. 8077-8097. NASA-supported research.
Astronomy and Astrophysics
Astronomy
61
Albedo, Color, Europa, Planetary Surfaces, Satellite Imagery, Astronomical Spectroscopy, Image Analysis, Multispectral Band Scanners, Planetology, Spaceborne Astronomy, Spectral Reflectance, Voyager Project
Scientific paper
New global and high-resolution multispectral mosaics of Europa have been produced from the Voyager imaging data. Photometric normalizations are based on multiple-image techniques that explicitly account for intrinsic albedo variations through pixel-by-pixel solutions. The exogenic color and albedo pattern on Europa is described by a second-order function of the cosine of the angular distance from the apex of orbital motion. On the basis of this second-order function and of color trends that are different on the leading and trailing hemispheres, the exogenic pattern is interpreted as being due to equilibrium between two dominant processes: (1) impact gardening and (2) magnetospheric interactions, including sulfur-ion implantation and sputtering redistribution. Removal of the model exogenic pattern in the mosaics reveals the endogenic variations, consisting of only two major units: darker (redder) and bright materials. Therefore Europa's visual spectral reflectivity is simple, having one continuous exogenic pattern and two discrete endogenic units.
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