Io: Energy constraints and plume volcanism |
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| Authors: | Ray T Reynolds Stanton J Peale Patrick Cassen |
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| Institution: | Theoretical and Planetary Studies Branch, Ames Research Center, NASA, Moffett Field, California 94035, USA;Joint Institute for Laboratory Astrophysics, University of Colorado, National Bureau of Standards, Boulder, Colorado 80309, USA;Theoretical and Planetary Studies Branch, Ames Research Center, NASA, Moffett Field, California 94035, USA |
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| Abstract: | Observational and theoretical considerations, including near-surface energy constraints, suggest a model of Io that features a surface layer of sulfur overlying an active silicate crust. Such a model would imply frequent contact between silicate magma intrusions and the sulfur layer. This contact could produce volcanic plumes driven by high-temperature sulfur vapor. Plumes driven by sulfur vapor meet observationall constraint for a wide range of possible conditions, in contrast to the special conditions required for plume generation by SO2. Characteristics of the two models are compared, and it is suggested that high-resolution infrared radiometry could identify the driving volatile. |
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