It's made from something which can generate magnetic fields, since Jupiter has a very strong magnetic field with a lot of distinct inhomogeneous features, resul

It's made from something which can generate magnetic fields, since Jupiter has a very strong magnetic field with a lot of distinct inhomogeneous features, resulting in some interesting radio emissions: https://www.ebsco.com/research-starters/science/jupiters-magnetic-field-and-radiation-belts https://www.ebsco.com/research-starters/science/jupiters-mag... https://radiojove.gsfc.nasa.gov/library/sci_briefs/decametric.htm https://radiojove.gsfc.nasa.gov/library/sci_briefs/decametri... The rotation of these features is the basis for the "system III" definition of longitude on Jupiter.