The Enigmatic Abundance of Atomic Hydrogen in Saturn’s Upper Atmosphere
The Enigmatic Abundance of Atomic Hydrogen in Saturn’s Upper Atmosphere
Abstract A planet’s Ly α emission is sensitive to its thermospheric structure. Here we report joint Hubble Space Telescope and Cassini cross-calibration observations of the Saturn Ly α emission made 2 weeks before the Cassini grand finale. To investigate the long-term Saturn Ly α airglow observed by different ultraviolet instruments, …