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
JPL
Torus
A satellite which has an atmosphere, such as Jupiter's moon Io, or even one with an icy surface which is exposed to energetic particles, such as Saturn's moon Rhea, will leave a cloud of particles behind as it orbits the planet. This cloud of particles is called a torus.
The torus is shown in yellow in this picture.
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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