ESA Science & Technology30-Jun-2005 16:35:02


Io Plasma Torus

The Io Plasma Torus (IPT), a doughnut-shaped ring of plasma rotating with the planet at the orbit of Jupiter's moon Io, was an object of special interest during the flyby. The IPT consists largely of ionised oxygen and sulfur atoms released as a neutral cloud by Io's volcanoes. The electron density of the IPT, measured by Ulysses a few hours after closest approach as the spacecraft crossed Jupiter's magnetic equator, were in good agreement with predictions based on older Voyager results.

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