Hubble space telescope far-ultraviolet observations of Io: Determining atmospheric abundances, mapping the sulfur dioxide distribution, and correlating the molecular and atomic atmosphere

Details Hubble space telescope far-ultraviolet observations of Io: Determining atmospheric abundances, mapping the sulfur dioxide distribution, and correlating the molecular and atomic atmosphere Hubble space telescope far-ultraviolet observations of Io: Determining atmospheric abundances, mapping the sulfur dioxide distribution, and correlating the molecular and atomic atmosphere

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt.........3f&link_type=abstract

PhD dissertation, Proquest Dissertations And Theses 2006. Section 0098, Part 0606 138 pages; [Ph.D. dissertation].United States

Computer Science

Sulfur Dioxide, Far-Ultraviolet, Ultraviolet, Io, Atmosphere

Scientific paper

Io's molecular and atomic atmosphere has been studied via far-ultraviolet spectroscopy obtained with the Hubble Space Telescope . Examination of an extensive data set reveals a sunlit SO 2 atmosphere which is temporally stable on a global scale, with only small local changes. An anti-/sub-Jovian asymmetry in the SO 2 distribution persists in all of the observations. The atmosphere is densest in the anti-Jovian equatorial regions, with a maximum column density of 5.0 × 10^16 cm -2 at 140° longitude. The SO 2 atmosphere also has greater latitudinal extent on the anti-Jovian hemisphere as compared to the sub-Jovian. The atmospheric distribution is best correlated with the location of known volcanic plumes. Theoretical sublimation atmosphere models cannot reproduce the asymmetry alone. Atomic S, O and Cl are also detected. Their abundances are derived and compared to the SO 2 . Sulfur is measured at a relative abundance of 9 × 10^-3 compared to SO 2 , oxygen at 0.05, and chlorine at 3-8.5 × 10^-4 .

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