Juno Spacecraft Probes the Source of Jupiter’s Magnetic Field

Characterizing the planetary magnetic field of Jupiter is one of the primary science objectives of the Juno Mission.

Global mapping of the field at completion of the 33 orbit Prime Mission suggests that Jupiter's magnetic field is generated by dynamo action at depth (beneath 0.81 Rj) in convective metallic hydrogen.
Model of Jupiter's interior.

The dynamo lies just beneath a layer of metallic hydrogen stabilized by the precipitation of “helium rain” – the helium rain prevents convective motions needed to power the dynamo.

Connerney, J.E.P. et al., (2022), Journal of Geophysical Research – Planets, 127, e2021JE007055. https://doi.org/10.1029/2021JE007055.

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