This is a drawing of Jupiter and its magnetosphere showing the magnetic field lines, the Io torus, and the plasmasheet (part of the plasmasphere)
Click on image for full size
A satellite which has an atmosphere, such as Jupiter's moon Io, will leave a cloud of particles behind as it orbits the planet. Rhea, a body with an icy surface exposed to energetic particles, will have a similar cloud, assuming it also has a magnetosphere. This cloud of particles is called a torus.
The torus is shown in yellow in this figure.
Eventually all the particles in the cloud will be turned to ions. The presence of ions cause a number of noticable effects in a magnetosphere:
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