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During the past few years, both the Cassini mission at Saturn and the Junomission at Jupiter, provided measurements with unprecedented accuracy of thegravity and magnetic fields of the two gas giants. Using the gravitymeasurements, it was found that the strong zonal flows observed at thecloud-level of the gas giants are likely to extend thousands of kilometers deepinto the planetary interior. However, the gravity measurements alone, which areby definition an integrative measure of mass, cannot constrain with highcertainty the exact vertical structure of the flow. Taking into account therecent Cassini magnetic field measurements of Saturn, and past secularvariations of Jupiter's magnetic field, we obtain an additional physicalconstraint on the vertical decay profile of the observed zonal flows on theseplanets. Our combined gravity-magnetic analysis reveals that the cloud-levelwinds on Saturn (Jupiter) extend with very little decay, i.e., barotropically,down to a depth of around 7,000~km (2,000~km) and then decay rapidly in thesemiconducting region, so that within the next 1,000 km (600~km) their valuereduces to about 1\% of that at the cloud-level. These results indicate thatthere is no significant mechanism acting to decay the flow in the outer neutralregion, and that the interaction with the magnetic field in the semiconductingregion might play a central role in the decay of the flows.

Combined magnetic and gravity measurements probe the deep zonal flows of the gas giants