Temperatures on Io: Implications to Geophysics, Volcanology, and Volatile Transport

Details Temperatures on Io: Implications to Geophysics, Volcanology, and Volatile Transport Temperatures on Io: Implications to Geophysics, Volcanology, and Volatile Transport

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..843m&link_type=abstract

Lunar and Planetary Science, volume 27, page 843

Physics

Geophysics

3

Atmospheres, Geophysics, Io, Volcanism, Voyager

Scientific paper

Voyager 1 IRIS spectra of Io from 4- to 55 micrometers wavelength have been further analyzed. We report two advances here: improved pointing corrections for the IRIS observations and improved background thermal models. The pointing corrections allow detailed mapping of thermal anomalies relative to surface features, thus enabling improved geologic interpretations. The identification of low-temperature (T) thermal anomalies due to cooling flows and pyroclastics, and to determination of Io's heat flow. The background Ts also provide important constraints on models of Io's atmosphere and volatile transfers. A new model for Io's surface that has emerged from this and other studies includes 3 basic thermophysical units: (1) bright, SO2-rich regolith with a high thermal inertia over ~80% of the surface; (2) darker, SO2-poor regolith with a low thermal inertia over ~18% of Io; and (3) high-T hot spots over ~2% of the surface. We present new evidence that unit 2 contains ubiquitous low-T geothermal anomalies from cooling volcanic deposits.

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