A view from the other side: complementary observations of the Jovian UV aurorae from Hubble and Juno

Starting from the Jupiter approach phase in early 2016, several Hubble Space Telescope observation campaigns dedicated to the UV aurorae have been executed in order to support the Juno mission. For example, these images have been used to study the auroral response to solar wind shocks measured by Juno's in situ instruments, or to identify the specific auroral morphologies associated with a compressed magnetosphere. In this presentation, we will focus on the images acquired simultaneously from Juno's UV spectrograph on one hand and from the Space Telescope Imaging Spectrograph on the other hand, each one looking at a different hemisphere. While the overall morphology is similar, variations of relative brightness between conjugate features, or shifts in the timing of some flares, are observed and are interpreted as signatures of distinct electron acceleration mechanisms or of magnetic field anomalies. Such combined observations thus provide unique insights into the asymmetries of the Jovian magnetosphere and its coupling with the ionosphere and upper atmosphere.