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Record 2 of 365
Exogenic and endogenic albedo and color patterns on Europa
Author and Affiliation:
Mcewen, A. S.(USGS, Flagstaff, Arizona State University)
Abstract: 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.
Publication Date: Jul 10, 1986
Document ID:
19860061863
(Acquired Nov 28, 1995)
Accession Number: 86A46601
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Journal of Geophysical Research; p. 8077-809; (ISSN 0148-0227); 91
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Geological Survey; Tucson, AZ, United States
Arizona Univ.; Tucson, AZ, United States
Description: 21p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ALBEDO; COLOR; EUROPA; PLANETARY SURFACES; SATELLITE IMAGERY; ASTRONOMICAL SPECTROSCOPY; IMAGE ANALYSIS; MULTISPECTRAL BAND SCANNERS; PLANETOLOGY; SPACEBORNE ASTRONOMY; SPECTRAL REFLECTANCE; VOYAGER PROJECT
Imprint And Other Notes: Journal of Geophysical Research (ISSN 0148-0227), vol. 91, July 10, 1986, p. 8077-8097. NASA-supported research.
Miscellaneous Notes: NASA-supported research
Availability Source: Other Sources
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