Simultaneous Hubble Space Telescope and Juno observations of a jovian auroral enhancement event

We present concurrent observations of Jupiter's auroras obtained with the Hubble Space Telescope and the planets magnetodisc and M-I coupling currents as observed by the Juno spacecraft, indicating an association of Jupiter's auroral intensity with current intensity. During PJ11 inbound, Juno measured in the middle magnetosphere a substantial increase in $B_\phi$ from a ‘nominal background of ~2 nT to 7-9 nT between ~30 and 55 R_J, implying increased equatorial radial current flowing as part of the M-I coupling current system associated with the planets auroral emission. During this interval, the $B_\rho$ component was also enhanced from ~10 to ~20 nT, indicating increased azimuthal current and associated radial force balance in the magnetodisc. During this interval of increased radial current, the Hubble Space Telescope observed a simultaneous enhanced intensity of the main emission, peaking at ~2 MR. We compare these observations with the Leicester magnetodisc model, referenced to preliminary Juno JADE plasma data, and the associated theoretical M-I coupling currents.