Jupiter has a main ring, an inner halo and two fainter and more distant gossamer rings. Observations of dust in the outer ring region with the surprising results of a gap in the rings interior to Thebe's orbit, grains on highly-inclined paths, and a strong excess of submicron-sized dust just inside Amalthea's orbit are reported. Detailed modelling shows that the passage of ring particles through Jupiter's shadow creates the Thebe Extension.
- Douglas P. Hamilton
- Harald Krüger