RAY TRACING OF BROAD-BAND BURSTY RADIO EMISSIONS FROM URANUS

To determine the source position of the broad‐band bursty emission, we traced rays of X‐mode emission from source positions along magnetic field lines with footprints that form a large grid centered approximately on the south magnetic pole of Uranus. We assumed the emission is just above the RX cutoff frequency, and we included sources only if the ratio of plasma to gyrofrequency was less than about 0.25. Contrary to the results of others who have assumed straight‐line propagation, we found, for large wave normal angles, source regions different from those producing b‐smooth emission, and along field lines with footprints in a relatively large area associated with the south magnetic pole. The emission which was observed prior to closest approach has a source along field lines that are distinct from those which generate emissions observed after closest approach. In order to understand these findings and the bursty nature of the emission we speculate the plasma distribution in the source region and/or the source mechanism is distinct from that which generates the b‐smooth emission. © 1990 by the Chinese Geophysical Society