Closed Fluxtubes and Dispersive Proton Conics at Jupiter's Polar Cap

J. R. Szalay, G. Clark, G. Livadiotis, D. J. McComas, D. G. Mitchell, J. S. Rankin, A. H. Sulaiman, F. Allegrini, F. Bagenal, R. W. Ebert, G. R. Gladstone, W. S. Kurth, B. H. Mauk, P. W. Valek, R. J. Wilson, S. J. Bolton

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Two distinct proton populations are observed over Jupiter's southern polar cap: a ∼1 keV core population and ∼1–300 keV dispersive conic population at 6–7 RJ planetocentric distance. We find the 1 keV core protons are likely the seed population for the higher-energy dispersive conics, which are accelerated from a distance of ∼3–5 RJ. Transient wave-particle heating in a “pressure-cooker” process is likely responsible for this proton acceleration. The plasma characteristics and composition during this period show Jupiter's polar-most field lines can be topologically closed, with conjugate magnetic footpoints connected to both hemispheres. Finally, these observations demonstrate energetic protons can be accelerated into Jupiter's magnetotail via wave-particle coupling.

Original languageEnglish (US)
Article numbere2022GL098741
JournalGeophysical Research Letters
Issue number9
StatePublished - May 16 2022

Bibliographical note

Funding Information:
We thank the many JADE and Juno team members that made these observations possible, M. Imai for JRM09 integrations, and B. Bonfond for the Figure 1 Jupiter image. We acknowledge Juno's NASA contracts NNM06AA75C and 699041X.

Publisher Copyright:
© 2022. The Authors.

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