Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 14, Pages 7122-7130Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL072837
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Funding
- Juno contract [NNM06AA75C]
- Science and Technology Facilities Council [ST/P000541/1] Funding Source: researchfish
- STFC [ST/P000541/1] Funding Source: UKRI
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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.
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