Vincent Hue — Juno at Jupiter: Juno-UVS overview and observations of the Io footprint

Juno is currently on an elliptical and polar orbit around Jupiter, since July 2016, and has successfully gathered data during 12 perijoves sequences. Juno offers a fantastic opportunity to study Jupiter’s magnetosphere and its spectacular auroral emissions, which can be seen as a window screen of the entire Jovian magnetosphere. The Juno Ultraviolet Spectrograph (UVS) is a UV spectrograph with a bandpass spanning 70 to 205 nm and is designed to characterize Jupiter’s UV emissions. We present a brief overview on Juno-UVS operations. We then present observations of the Io footprints as seen by UVS. The Io footprints are a characterization of the complex magnetodynamic interaction at Io and modulated by the inner magnetosphere of Jupiter. Previous observations taken with the Hubble Space Telescope allowed the characterization of the footprints as a function of Io’s centrifugal latitude, despite observational bias that Earth-based observers are subject to. Juno’s unique vantage point in the Jovian system removes these biases allowing UVS access to the full range of Io’s varying centrifugal latitude and all possible local time geometries.