Figure 7.

Image of Jupiter's radiation belts mapped from 13.8 MHz radio emission measured by the U.S. Cassini orbiter in January 2001 during its flyby of the planet. A superposed telescopic image of Jupiter to scale shows the size and orientation of the belts relative to the planet. Interpreted as synchrotron radiation, the emission delineates a doughnut-shaped region surrounding Jupiter where electrons moving near the speed of light radiate as they gyrate in the Jovian magnetic field. (Image courtesy NASA/JP). A lunar VLF radio interferometer can resolve the lobes and track the spatio-temporal variations of the lobes, in particular during Io induced radio bursts. (Online version in colour.)