Figure 12-14: Jupiter’s Magnetosphere Created by the planet’s rotation, the ion-trapping regions of Jupiter’s magnetosphere (in orange, analogous to the Van Allen belts) extend into the realm of the Galilean moons. Gases originating from Jupiter’s moons Io and Europa form tori (doughnut-shaped regions) in the magnetosphere. Some of Io’s particles are pulled by the field onto Jupiter. Swept back by the solar wind, the magnetosphere has a “magnetotail” pointing away from the Sun. The magnetotail is often over 500 million km long and sometimes it reaches all the way to Saturn.

(J. Clarke, University of Michigan, and NASA)