Spectral variations over Europa's surface determined from Galileo Near Infrared Mapping Spectrometer (NIMS) measurements

Details Spectral variations over Europa's surface determined from Galileo Near Infrared Mapping Spectrometer (NIMS) measurements Spectral variations over Europa's surface determined from Galileo Near Infrared Mapping Spectrometer (NIMS) measurements

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..891m&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 891.

Other

Europa, Satellite Surfaces, Galileo Spacecraft, Infrared Spectrometers, Spacecraft Instruments, Near Infrared Radiation, Northern Hemisphere

Scientific paper

During the first targeted encounter of Europa by the Galileo spacecraft, occurring in December 1996, the NIMS observed this satellite over the spectral range 0.7-5.2 microns. These observations were performed with high spectral and spatial resolution for polar and high latitude regions. Lower resolution global observations, centered on the same longitudes, were also obtained to provide global context information of the trailing side of Europa. The spectra of Europa indicate, as expected, the dominant presence of H2O frost, but there is evidence for other contributions to the spectrum, perhaps attributable to a hydrated mineral phase. There are significant albedo variations over the observed surfaces. NIMS measurements at 0.7 micron show patterns similar to the Voyager visible maps, but there are noticeable differences such as the (Voyager) high albedo region at about 42 N and 287 W, which is much brighter than the corresponding IR signature.

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