Relation of jovian main auroral emission intensity to magnetospheric currents during the Juno mission

We report on a study of the relation between the intensity of the dawnside jovian main emission as observed using the Hubble Space Telescope with the large-scale current systems in Jupiter's middle-outer magnetosphere as observed by the Juno spacecraft. Previous work has highlighted an association between these phenomena based on individual case studies, such as a disturbed interval in February 2018 (e.g. Nichols et al. 2020. Here we take a broad view of the relation between the two data sets over the course of the Juno mission to date. Specifically, we show that overall there is a significant correlation between the intensity of the dawnside main emission arc and the contemporaneous equatorial radial ("corotation enforcement") current as calculated from the azimuthal component of the magnetic field in the dawnside magnetosphere. We discuss the origin of the association along with the implications for the dynamics of Jupiter's magnetosphere. We also consider the cases which do not seem to follow the overall trend and discuss possible causes of this variation.