# What causes the aurora of other planets to have different colors?

All I could come up with is it depends on the atmospheric composition of the planet as they will interact with the charged solar particles which might be true but is there is there a definite reason behind the different colors of aurorae on other worlds (Saturn's blue aurora for example)?

• 'Different' You can look that up with 0 work. Gas giant atmospheres are dominated by $H_2$. It's the $H_2$ bands that radiate in the UV when excited by elctron precipitation. They don't radiate in the optical as the hydrogen molecule doesn't have allowed lines there. – AtmosphericPrisonEscape Sep 2 '15 at 2:52