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On the Relation Between Jupiter's Aurora and the Dawnside Current Sheet

Wei, Y.; Delamere, P. A.; Badman, S. V. +10 more

Jupiter's auroral emission is a spectacular phenomenon that provides insight into energy release processes related to the coupling of its magnetosphere and ionosphere. This energy release is influenced by solar wind conditions. Using joint observations from Juno and the Hubble Space Telescope (HST), we statistically investigate the relationship be…

Jovian Magnetospheric Injections Observed by the Hubble Space Telescope and Juno

Wilson, R. J.; Bagenal, F.; Orton, G. S. +13 more

We compare Hubble Space Telescope observations of Jupiter's FUV auroras with contemporaneous conjugate Juno in situ observations in the equatorial middle magnetosphere of Jupiter. We show that bright patches on and equatorward of the main emission are associated with hot plasma injections driven by ongoing active magnetospheric convection. During …

Hubble Detects the Start of a New Saturn Ring Spoke Season

Nicholson, Philip D.; Hedman, Matthew M.; Showalter, Mark R. +4 more

Saturn's ring spokes typically appear over an 8-year duration centered on equinox. Hubble Space Telescope observations in 2021 indicate the beginning of a new spoke season as Saturn approaches equinox in 2025. The spokes show increased contrast and longevity in 2022, persisting for up to 11 hours. The spokes are visible from UV to near-IR and are …