  Jupiter was discovered to be a source of high speed dust particles by the
Ulysses spacecraft in 1992. These dust particles originate from the volcanic
plumes on Io. They collect electrostatic charges from the plasma environment,
gain energy from the co-rotating electric field of the magnetosphere, and leave
Jupiter with escape speeds over $\rm 200 km s^{-1}$. The dust streams were also
observed by the Galileo and Cassini spacecraft. While Ulysses and Cassini only
had a single encounter with Jupiter, Galileo has continuously monitored the
dust streams in the Jovian magnetosphere since 1996. The observed dust fluxes
exhibit large orbit-to-orbit variability due to both systematic and stochastic
changes. By combining the entire data set, the variability due to stochatic
processes can be approximately removed and a strong variation with Jovian local
time is found. This result is consistent with theoretical expectations and
confirms that the majority of the Jovian dust stream particles originate from
Io rather than other potential sources.
