Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...499..475h&link_type=abstract
Astrophysical Journal v.499, p.475
Astronomy and Astrophysics
Astronomy
83
Atomic Processes, Line: Identification, Planets And Satellites: Individual Europa, Planets And Satellites: Individual Ganymede, Planets And Satellites: Individual Jupiter, Ultraviolet: Solar System
Scientific paper
Far-UV spectra of Europa and Ganymede, acquired by the Hubble Space Telescope Goddard High Resolution Spectrograph, indicate that, in addition to faintly reflected sunlight, both satellites emit O I 1304 Angstroms and O I 1356 Angstroms airglow radiation. The observed brightnesses of the reflected solar C II 1335 Angstroms feature indicate that the disk-averaged albedos of Europa and Ganymede are about 1.5% and 2.6%, respectively. Airglow emissions from both satellites are characterized by the flux ratio F(1356 Angstroms)/F(1304 Angstroms) of roughly 1-2, diagnostic of dissociative electron impact excitation of O2. Inferred O2 vertical column densities are in the range (2.4-14) x 1014 cm-2 for Europa and (1-10) x 1014 cm-2 for Ganymede. The observed double-peaked profile of Ganymede's O I 1356 Angstroms feature indicates a nonuniform spatial emission distribution that suggests two distinct and spatially-confined emission regions, consistent with the satellite's north and south poles.
Feldman Paul D.
Hall Doyle T.
McGrath Melissa A.
Strobel Darrell F.
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