DPS 2001 meeting, November 2001
Session 47. Icy Galilean Satellites II: Surface Composition
Oral, Chair: D. Domingue, Friday, November 30, 2001, 3:00-4:00pm, Regency GH

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[47.01] Radiolysis: Icy Satellite Atmospheres and Surface Aging

R.E. Johnson (University of Virginia), R.W. Carlson (Jet Propulsion Laboratory), F. Leblanc (Service d'Aeronomie du CNRS ), V.I. Shematovich (Institute of Astronomy RAS)

The jovian trapped particle radiation chemically alters the Galilean satellite surfaces, a process referred to as radiolysis. This leads to the chemical alteration and decomposition of the surface materials and the production of volatiles (Johnson 2001). Radiolysis likely accounts for the darkening of the polar regions of Io (Johnson 1997), the O2 (Calvin et al 1996), peroxide (Carlson et al 1999a) and, possibly, O3 (Noll et al 1996) in icy satellite surfaces, the radiolytic sulfur cycle on Europa (Carlson et al 1999b), the production of O2 (Hall et al. 1995) and alkali atmospheres (Brown and Hill, 1996) and, possibly, the production of the CO2 atmosphere at Callisto (Carlson 1999). Results for the radiolytic processing of likely surface materials will be used to create atmospheric models and to describe surface aging. Emphasis will be on Europa's surface and atmosphere.

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