Observations from NASA’s Cassini spacecraft have been used to build, for the first time, a 3-D picture of the sources of intense radio emissions in Saturn’s magnetic field, known as the Saturn Kilometric Radiation (SKR).
Saturn Kilometric Radiation is the most intense component of radio emissions from Saturn. It was discovered by NASA’s Voyager spacecraft in 1980. The radio emissions have frequencies between about 10 kilohertz and 1.2 megahertz. This corresponds to the Long Wave and Medium Wave broadcasting bands.
The results were presented by Dr Baptist Cecconi, of LESIA, Observatoire de Paris, at the European Planetary Science Congress on Tuesday 23rd September.
The SKR radio emissions are generated by high-energy electrons spiralling around magnetic field lines threaded through Saturn’s auroras. Previous Cassini observations have shown that the SKR is closely correlated with the intensity of Saturn’s UV aurora and the pressure of the solar wind.