This is an image of Io.
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The Io Magnetic Field
The chances are that there is a magnetic field for Io. Io is composed
of lots of iron, Io is warm inside, and Io spins rapidly. These are all the ingredients for a magnetic field. The Galileo spacecraft will take detailed measurements to make a determination of whether there is an Ionian magnetic field or not.
Io's main contribution to Jupiter's magnetosphere is known as the "Io Torus", a donut-shaped cloud of particles which came from the atmosphere and found their way into the the magnetosphere. The cloud forms along the path of Io's orbit. This object has a major influence on Jupiter's magnetosphere.
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