Morphological differences between Saturn's ultraviolet aurorae and those of Earth and Jupiter - Clarke,JT; Gérard,JC; Grodent,D; Wannawichian,S; Gustin,J; Connerney,J; Crary,F; Dougherty,M; Kurth,W; Cowley,SWH; Bunce,EJ; Hill,T; et al. (NATURE, 2005)