Dynamic auroral storms on Saturn as observed by the Hubble Space Telescope. - Nichols JD; Badman SV; Baines KH; Brown RH; Bunce EJ; Clarke JT; Cowley SW; Crary FJ; Dougherty MK; Gérard JC; Grocott A; Grodent D; et al. (Geophysical research letters, 2014)