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R. Prangé, L. Pallier (IAS, Orsay, France), J.E.P. Connerney (NASA/GSFC, Greenbelt), R. Courtin (DESPA, Obs. Paris, Meudon, France), J.C. McConnell, C. Parkinson (York Univerisity, Toronto, Canada)
We have obtained FUV images of Saturn on two consecutive days of December 2000 with STIS onboard the Hubble Space Telescope. Significant variations have been observed in the morphology of auroral emissions. We will discuss these changes, never recorded so far, and unlike those obseved on Jupiter and/or on Earth.