Jupiter's main auroral oval provides a window into the complex magnetospheric dynamics of the Jovian system. The Juno spacecraft entered orbit about Jupiter on 5 July 2016 and carries on board the Auroral Distributions Experiment (JADE) that can directly sample the auroral plasma structures. Here we identify five distinct regimes in the JADE data based on composition/energy boundaries and magnetic field mappings, which exhibit considerable symmetry between the northern and southern passes. These intervals correspond to periods when Juno was connected to the Io torus, inner plasma sheet, middle plasma sheet, outer plasma sheet, and the polar region. When connected to the torus and inner plasma sheet, the heavy ions are consistent with a corotating pickup population. For Juno's first perijove, we do not find evidence for a broad auroral acceleration region at Jupiter's main auroral oval for energies below 100 keV.
Juno/JADE made high temporal resolution measurements at high latitudes of the Io torus and plasma sheet plasma populations
We identify regions where Juno was connected to the Io torus, inner plasma sheet, middle plasma sheet, outer plasma sheet, and high‐latitude polar region
For JADE's first auroral transits at ~0.7 RJ altitude and <100 keV, we find no evidence for a broad Jovian auroral acceleration region