How powerful is Ganymede's magnetosphere compared to Europa?

Ganymede's is about four times as powerful as Europa's. This may be because of their different forms, although we're not sure as yet. read more

Ganymede’s is about four times as powerful as Europa's. This may be because of their different forms, although we're not sure as yet. (Ganymede is akin to Earth with a molten iron core and a rocky mantle, although it has an icy shell atop it. read more

Sodium is at least 13 times less abundant around Ganymede than around Europa, possibly because of a relative deficiency at the surface or because the magnetosphere fends off energetic particles. Another minor constituent of the Ganymedian atmosphere is atomic hydrogen. read more