The Jupiter-Io plasma torus (in red) is a result of Jupiter’s magnetic field sweeping up material from Io’s volcanic eruptions. As Io moves through the torus, interactions between Io and Jupiter power a huge electrical current that extends from one body to the other. This flux tube is shown in green.
John Spencer
There is no danger that Io will spiral down into Jupiter on a timescale of several million years.
Io’s volcanic eruptions do not create the electromagnetic torus. But they do contribute material to it.
