Magnetic Signature of Oceanic Circulation on Ganymede

This research investigates the magnetic signature of oceanic circulation in Ganymede's subsurface ocean using kinematic induction modeling. By coupling zonal jet flows from rotating thermal convection simulations with magnetic field models, the study demonstrates that Ganymede's intrinsic magnetic field creates favorable conditions for detecting subsurface ocean dynamics. The results indicate that ocean flows generate a predominantly toroidal magnetic field through the omega-effect, with a weaker poloidal component pervading beyond the conductive ocean layer. The detection of these magnetic signals, particularly in deep ocean scenarios with magnetic Reynolds numbers above unity, could provide valuable insights into the ocean's structure and circulation patterns. The study emphasizes the need for low-altitude orbits for the Juice probe to maximize the chances of detecting these subtle magnetic variations. This research contributes to our understanding of Ganymede's habitability and the potential for life to exist in subsurface oceans.

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