Ganymede northern high latitude frosts - Preliminary observations from Galileo SSI data

Physics

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Ganymede, Satellite Surfaces, Frost, Galileo Spacecraft, Satellite Imagery, Polar Regions, Satellite Observation, Solid State Devices, Grooves, Terrain Analysis

Scientific paper

One major objective of the Galileo Solid State Imaging team targeting for Ganymede was to observe high latitudes (both globally in color, and locally) to determine the characteristics of the high-latitude and polar brightening that was observed in Voyager data. Voyager observations showed that there was: (1) a better preservation of bright crater rays at high latitudes (crater materials south of the cap are generally of low to intermediate albedo, interpreted to mean that greater frost ablation occurs there and leaves a silicate-enriched lag) and (2) a continuous diffuse, bright deposit (without relief) known as the polar frost caps or hoods. Several hypotheses were proposed to account for these Voyager observations. Initial images obtained in the G2 light-dark boundary sequence at 45 m/pixel are shedding light on this issue. Specifically, we describe here initial observations of the terrain seen in image SO359946135 of the light-dark boundary sequence.

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