On the Jovian aurorae: recent observational results from the Hubble Space Telescope

The STIS and ACS instruments on board the Hubble Space Telescope revolutionized our understanding of the aurorae at Jupiter. The high sensibility and high spatial resolution of these UV cameras allowed us to realize that these auroral emissions are made of a multitude of sub-components, such as the satellite footprints or the Polar Auroral Filaments. Moreover, these sub-components originate from very different regions in the magnetosphere and arise from totally different processes. Here I will review these newly described sub-components with a focus on what we understand, and, more interestingly, on what we still don't understand about them.