Reanalysis of Galileo PPR data gives Europa a mean thermal inertia of 56 tiu and regolith porosity of 0.61, with spatial variations tied to sputtering rates rather than geological units.
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Thermophysical Properties of Europa's Surface Constrained by Galileo Photopolarimeter-Radiometer Temperature Measurements
Reanalysis of Galileo PPR data gives Europa a mean thermal inertia of 56 tiu and regolith porosity of 0.61, with spatial variations tied to sputtering rates rather than geological units.