We report on dust measurements obtained during the seventh orbit of the Galileo spacecraft about Jupiter .
The most prominent features observed are highly time variable dust streams recorded throughout the Jovian system .
The impact rate varied by more than an order of magnitude with a 5 and 10 hour periodicity , which shows a correlation with Galileo ’ s position relative to the Jovian magnetic field .
This behavior can be qualitatively explained by strong coupling of nanometer-sized dust to the Jovian magnetic field .
In addition to the 5 and 10 h periodicities , a longer period which is compatible with Io ’ s orbital period is evident in the dust impact rate .
This feature indicates that Io most likely is the source of the dust streams .
During a close ( 3,095 km altitude ) flyby at Ganymede on 5 April 1997 an enhanced rate of dust impacts has been observed , which suggests that Ganymede is a source of ejecta particles .
Within a distance of about 25 R _ { J } ( Jupiter radius , R _ { J } = 71 , 492 km ) from Jupiter impacts of micrometer-sized particles have been recorded which could be particles on bound orbits about Jupiter .