Chemistry and Vent Pressure of Very High-Temperature Gases Emitted from Pele Volcano on Io

Galileo data for magma temperature at Pele and HST chemical data (SO2, S2, and SO) for Pele plumes were used to evaluate vent pressure (10 -4 -2 bar), the oxidation state (2-3 log fO2 units below Ni-NiO), and chemistry of volcanic gases. Additional information is contained in the original extended abstract.