Fig. 3.

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Calculated line-of-sight column-density maps of the CO2 exosphere of Ganymede above the leading side from the EGM model (in units of 1018 m−2). Left: CO2 release associated with H2O sublimation with a CO2/H2O relative abundance of 5 for an H2O areal ice fraction of 50% at latitudes > 50°N. Right: Sputtering of H2O ice with CO2/H2O = 0.01 at latitudes > 40°N; the result was multiplied by 382 to match the observations (Appendices K, L). The green lines display the OCFBs. The subsolar point is at 2.6°N, 82°W.
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