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L. Pallier, R. Prange (Institut d'Astrophysique Spatiale, Université Paris Sud, ORSAY, FRANCE)
We have analyzed a set of far UV images of Jupiter taken on the 8th and from the 13th to16th of August 1999 with the STIS instrument on board the Hubble Space Telescope. These images of both hemispheres cover a wide range of longitudes and display all the auroral structures identified so far: the main ovals, low latitude ovals, the two inner ovals in the northern hemisphere and the footprint of three Galilean satellites. We specifically study a variable bright emission located in the northern hemsiphere, between the inner ovals which remains fixed in local magnetic time and may be associated with the north jovian polar cusp. We will discuss brightness varations of this emission with the dynamic of the solar wind and a possible southern counterpart. Some variable structures, visible at high latitude in these images, inside the polar cap, will also be analysed.