Europa's Ultraviolet Absorption Feature: Correlation with Endogenic Surface Features on the Trailing Hemisphere

Details Europa's Ultraviolet Absorption Feature: Correlation with Endogenic Surface Features on the Trailing Hemisphere Europa's Ultraviolet Absorption Feature: Correlation with Endogenic Surface Features on the Trailing Hemisphere

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.5907h&link_type=abstract

American Astronomical Society, DPS meeting #40, #59.07; Bulletin of the American Astronomical Society, Vol. 40, p.507

Astronomy and Astrophysics

Astronomy

Scientific paper

Disk-integrated UV observations of Europa from the International Ultraviolet Explorer (IUE) (Lane et al., Nature 292, 38, 1981) and Hubble Space Telescope (HST) (Noll et al., JGR 100,19057, 1995) show an absorption feature centered at 280 nm on the trailing hemisphere. Low-resolution disk-resolved UV observations from the Galileo Ultraviolet Spectrometer (UVS) (Hendrix et al., Icarus, 135, 79, 1998) measured a decrease UV absorption strength with distance from the trailing hemisphere apex (270°W). The absorption has been suggested to be due to an exogenic activity such as implantation of sulfur ions (Lane et al.), or to endogenic sulfur dioxide (Noll et al.).
Early analysis of high-resolution Galileo UVS observations showed a general correlation between the 280 nm absorption feature and the dark terrain on Europa's trailing hemisphere. We now quantify that correlation by comparing the strength of the 280 nm absorption feature across the surface with the strength of the asymmetric water ice bands, measured in dark terrains by the Galileo Near-Infrared Mapping Spectrometer (NIMS), to explore the possible relationships with exogenic and endogenic processes. We investigate the identification of the 280 nm absorption feature by comparing with laboratory spectra.

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