Juno-UVS observation of the Io footprint

The perijove observations performed by Juno-UVS nominally range from -5 hours up to +5 hours about perijove, during which Juno’s distance to Jupiter ranges from 7 RJ down to 1.05 RJ. The Io footprints are a characterization of the complex electrodynamic interaction generated at Io and modulated by the inner magnetosphere of Jupiter. Previous observations 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 centrifugal latitudes and all possible local time geometries. We will present our investigation of the local time variability in Io’s footprint emitted power and color ratio, including observations of the footprints while Io was in eclipse.