PHENOMENOLOGY OF NEPTUNE RADIO EMISSIONS OBSERVED BY THE VOYAGER PLANETARY RADIO ASTRONOMY EXPERIMENT

The Neptune flyby in 1989 added a new planet to the known number of magnetized planets generating nonthermal radio emissions. We review the Neptunian radio emission morphology as observed by the planetary radio astronomy experiment on board Voyager 2 during a few weeks before and after closest approach. We present the characteristics of the two observed recurrent main components of the Neptunian kilometric radiation, i.e., the ''smooth'' and the ''bursty'' emissions, and we describe the many specific features of the radio spectrum during closest approach.