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Much of the preceding is taken from the original caption to the image shown, written by JPL/NASA staff, but revised in light of additional data received subsequent to the composition of this image.<ref>"[http://photojournal.jpl.nasa.gov/catalog/PIA01082 Catalog page for Image PIA01082]," ''NASA/JPL Photojournal''. Accessed February 29, 2008.</ref>
Much of the preceding is taken from the original caption to the image shown, written by JPL/NASA staff, but revised in light of additional data received subsequent to the composition of this image.<ref>"[http://photojournal.jpl.nasa.gov/catalog/PIA01082 Catalog page for Image PIA01082]," ''NASA/JPL Photojournal''. Accessed February 29, 2008.</ref>
== Magnetospheres ==
Io, Europa, and Ganymede all definitely possess their own internal magnetic fields. But because they lie well within Jupiter's magnetosphere, most of the magnetic fluxes are induced by Jupiter's field interacting with either the conductive core of Io or the conductive shells (possible subsurface oceans) of Europa and Ganymede. Ganymede's field is strong enough to define its own magnetosphere inside that of Jupiter.
Callisto's magnetic fluxes are very weak, and its internal magnetic field is probably undetectable. Callisto has a weak ''induced'' magnetic field, though it lies outside Jupiter's magnetosphere.
== Io ==
== Io ==