Thermal Convection in the Core of Ganymede Inferred from Liquid Eutectic Fe-FeS Electrical Resistivity at High Pressures

The electrical resistivity of solid and liquid Fe-FeS was measured using a 4-wire resistance technique at pressures from 2-5 GPa and the thermal conductivity was calculated using the Wiedemann-Franz Law from the electrical measurements. The results were used to estimate the pressure-dependent eutectic temperatures of the system and adiabatic conductive heat flow at the top of a molten Fe-FeS core model of Ganymede, which showed that thermal convection is permissible as a dynamo power source.