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Discovery of Gaseous S₂ in Io's Pele Plume

Ballester, Gilda E.; McGrath, Melissa A.; Spencer, John R. +2 more

Spectroscopy of Io's Pele plume against Jupiter by the Hubble Space Telescope in October 1999 revealed absorption due to S₂ gas, with a column density of 1.0 +/- 0.2 × 10¹⁶ per square centimeter, and probably also SO₂ gas with a column density of 7 +/- 3 × 10¹⁶ per square centimeter. This SO₂/…