Evidence for sulphur implantation in Europa's UV absorption band

Details Evidence for sulphur implantation in Europa's UV absorption band Evidence for sulphur implantation in Europa's UV absorption band

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292...38l&link_type=abstract

Nature, vol. 292, July 2, 1981, p. 38, 39.

Physics

114

Europa, Ion Injection, Jupiter Atmosphere, Spectrum Analysis, Sulfur Dioxides, Ultraviolet Absorption, Absorption Spectra, Albedo, Earth Magnetosphere, Energetic Particles, Iue, Orbital Mechanics, Ultraviolet Reflection, Jupiter, Satellites, Europa, Sulfur, Ultraviolet, Wavelengths, Data, Absorption, Iue, International Ultraviolet Explorer, Observations, Spectrum, Characteristics, Albedo, Reflectivity, Sulfur Dioxide, Ions, Magnetosphere, Injection, Analysis, Bands

Scientific paper

The UV spectral characteristics of the Galilean satellites are investigated (using data from the International Ultraviolet Explorer (IUE) spacecraft) as a function of the orbital position, large-scale areal variability, and temporal dynamics. The discovery of an absorption feature at 280 nm in Europa's reflection spectrum is reported and observations show that the absorption is strongest on the trailing hemisphere (central longitude 270 degrees). The feature resembles SO2 and seems to result from S-O bond formation between deeply implanted sulphur atoms and the adjacent damaged water-ice-lattice. The sulphur supposedly comes from energetic (hundreds of keV) sulphur ions that are present in the Jovian magnetosphere. An appropriate equilibrium condition can be found to match the observed spectral data if sputtering erosion occurs at no greater than approximately 20 meters per one billion years.

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