Constraints on the solid-state greenhouse effect on the icy Galilean satellites

摘要: Surface temperature data from the Voyager spacecraft provide a constraint on magnitude of possible solid-state greenhouse effect icy Galilean satellites. A will occur if regoliths Europa, Ganymede, and Callisto are optically thin in visible opaque thermal infrared, which would be consistent with particulate water ice. We examine detail effects using different values for light penetration depth regolith properties diurnal variation surface temperature. then compare model results measurements all three conclude that is limited to approximate range 0 cm ≤ ζ 2.2 where characteristic e-folding insolation absorption length; this produces an increase subsurface temperatures approximately 10 K or less. Similarly, Ganymede both have allowable ranges 0.5 based temperature, no significant heating layers. The amount strongly dependent assumed regolith.