Volcanic Production of Sulfur Monoxide (SO) on Io

Mikhail Yu Zolotov, Bruce Fegley

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


We use thermochemical equilibrium calculations to show that SO is expected in volcanic gases erupted on Io, and derive the range of temperatures, pressures, and elemental compositions that provide the observed SO/SO2ratio of 3-10% in Io's atmosphere. Our predictions could be tested during the Galileo Europa Mission (GEM), by Earth-based and Hubble Space Telescope observations in the millimeter and UV regions, or by a mass spectrometer and/or infrared spectrometer on an Io Volcanic Observer mission.

Original languageEnglish (US)
Pages (from-to)431-434
Number of pages4
Issue number2
StatePublished - Apr 1998
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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