A post-Voyager view of Jupiter's magnetosphere

Exploration of the plasma envelope around Jupiter by the two Voyager spacecraft in 1979 has revealed an enormously large magnetosphere filled with an unusual mixture of plasma, consisting of hydrogen, helium, sulphur, and oxygen in similar proportions. In its outer regions the magnetosphere is inflated by the pressure of the hot (~300 × 10⁶ degrees Kelvin) plasma, which has its origin in the volcanoes of the satellite Io. The rotational aspect of this magnetosphere is similar to magnetospheres of rapidly rotating astrophysical objects.     

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