Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.5507s&link_type=abstract
American Astronomical Society, DPS meeting #30, #55.P07; Bulletin of the American Astronomical Society, Vol. 30, p.1448
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Infrared observations of Europa by the Near Infrared Mapping Spectrometer (NIMS) in the final orbit of the Galileo mission and in the early orbits of the Galileo Europa mission show absorptions at 4.25 and 4.03 microns. These absorptions occur in a region of the spectrum that has very low signal because of the ubiquitous presence of water ice, which absorbs strongly between 2.5-5 microns. The observations exhibiting these absorptions were obtained at relatively long ranges from Europa to minimize the effects of radiation from Jupiter, improving the signal to noise ratio. They were centered about a Europa longitude of approximately 120 degrees. The band centered at 4.25 microns is relatively strong and is consistent with absorptions by CO2.The band at 4.03 microns lies at the limit of detectability and can be attributed to SO2. The distribution of these absorptions across the surface are similar.
Carlson Richard W.
Matson Dennis L.
McCord Th. B.
NIMS Team
Ocampo Adriana
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