A DETERMINATION OF THE SOURCE OF JOVIAN HECTOMETRIC RADIATION VIA OCCULTATION BY GANYMEDE

During the first Galileo flyby of Ganymede, Jovian radio emissions in the frequency range of 700 kHz to 5.6 MHz were completely occulted by the satellite. We take advantage of this serendipitous observation to determine the lo cation of the radio emission source relative to Jupit er. The evidence suggests that the apparent source is along an L great er than or similar to 7 magnetic field line near the central meridian longitude (similar to 160 degrees) of the spacecraft and at 1 to 3 Jov ian radii above the northern hemisphere of Jupiter. These results are consistent with a source located along either the Ganymede or Europa f lux tube.