What drives aurorae on Saturn? To help find out, scientists have sorted through hundreds of infrared images of Saturn taken by the Cassini spacecraft for other purposes, trying to find enough aurora images to correlate changes and make movies.
Once made, some movies clearly show that Saturnian aurorae can change not only with the angle of the Sun, but also as the planet rotates. Furthermore, some auroral changes appear related to waves in Saturn’s magnetosphere likely caused by Saturn’s moons. Pictured above, a false-coloured image taken in 2007 shows Saturn in three bands of infrared light.