Auroral hiss observed near the Io plasma torus

A band of whistler-mode noise identified as auroral hiss has been observed during the Voyager 1 flyby of Jupiter on 5 March 1979 on the inner edge of the Io plasma torus. This noise provides evidence for the existence of aurora-like charged particle beams on magnetic field lines through the inner edge of the torus. These beams probably consist of low-energy electrons and may be associated with field-aligned currents linking the plasma torus to the jovian ionosphere. (author)