''Saturn is a source of intense radio emissions. The radio waves are closely related to the auroras near the poles of the planet. These auroras are similar to Earth's northern and southern lights. The Cassini spacecraft began detecting these radio emissions in April 2002 when Cassini was 2.5 astronomical units from the planet using the Cassini Radio and Plasma Wave Science (RPWS) instrument...''
sources:
http://www-pw.physics.uiowa.edu/space-audio/cassini/SKR1/
http://www.sciencedaily.com/releases/2011/03/110323145552.htm
