Observations of Jupiter’s Hydrogen Airglow by Juno’s UVS

While the primary function of the Juno spacecraft’s Ultraviolet Spectrograph (UVS) during perijove is to observe Jupiter’s auroral features, it is also capable of detecting and measuring Jupiter’s airglow. The perijove location of Juno in Jupiter’s upper atmosphere allows for the UVS to detect Hydrogen Lyman-alpha and H2 emissions as a function of zenith angle. We look at the features of Jupiter’s airglow beginning early in the mission to attempt to determine trends based on a variety of criteria, including spacecraft latitude and local time information, solar zenith angle, and the location of the emissions themselves. Juno-UVS is also well suited to search for “shuttle glow” as the spacecraft moves through Jupiter’s atmosphere. “Shuttle glow” has been observed at Earth as a result of a spacecraft re-entering or orbiting at low altitude within an atmosphere. We will describe attempts to detect and characterize these photon emissions with Juno, which moves through Jupiter’s upper atmosphere at ~60 km/s.