@article{Sulaiman:2022:10.1029/2022JA030334,
author = {Sulaiman, A and Mauk, B and Szalay, J and Allegrini, F and Clark, G and Gladstone, R and Kotsiaros and Kurth, W and Bagenal, F and Bonfond, B and Connerney, J and Ebert, R and Elliott, S and Gershman, D and Hospodarsky, G and Hue, V and Lysak, R and Masters, A and Santolik and Saur, J and Bolton, S},
doi = {10.1029/2022JA030334},
journal = {Journal of Geophysical Research: Space Physics},
title = {Jupiter’s low-altitude auroral zones: Fields, particles, plasma waves, and density depletions},
url = {http://dx.doi.org/10.1029/2022JA030334},
volume = {127},
year = {2022}
}

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TY  - JOUR
AB  - The Juno spacecraft's polar orbits have enabled direct sampling of Jupiter's low-altitude auroral field lines. While various data sets have identified unique features over Jupiter's main aurora, they are yet to be analyzed altogether to determine how they can be reconciled and fit into the bigger picture of Jupiter's auroral generation mechanisms. Jupiter's main aurora has been classified into distinct “zones”, based on repeatable signatures found in energetic electron and proton spectra. We combine fields, particles, and plasma wave data sets to analyze Zone-I and Zone-II, which are suggested to carry upward and downward field-aligned currents, respectively. We find Zone-I to have well-defined boundaries across all data sets. H+ and/or H3+ cyclotron waves are commonly observed in Zone-I in the presence of energetic upward H+ beams and downward energetic electron beams. Zone-II, on the other hand, does not have a clear poleward boundary with the polar cap, and its signatures are more sporadic. Large-amplitude solitary waves, which are reminiscent of those ubiquitous in Earth's downward current region, are a key feature of Zone-II. Alfvénic fluctuations are most prominent in the diffuse aurora and are repeatedly found to diminish in Zone-I and Zone-II, likely due to dissipation, at higher altitudes, to energize auroral electrons. Finally, we identify significant electron density depletions, by up to 2 orders of magnitude, in Zone-I, and discuss their important implications for the development of parallel potentials, Alfvénic dissipation, and radio wave generation.
AU  - Sulaiman,A
AU  - Mauk,B
AU  - Szalay,J
AU  - Allegrini,F
AU  - Clark,G
AU  - Gladstone,R
AU  - Kotsiaros
AU  - Kurth,W
AU  - Bagenal,F
AU  - Bonfond,B
AU  - Connerney,J
AU  - Ebert,R
AU  - Elliott,S
AU  - Gershman,D
AU  - Hospodarsky,G
AU  - Hue,V
AU  - Lysak,R
AU  - Masters,A
AU  - Santolik
AU  - Saur,J
AU  - Bolton,S
DO  - 10.1029/2022JA030334
PY  - 2022///
SN  - 2169-9380
TI  - Jupiter’s low-altitude auroral zones: Fields, particles, plasma waves, and density depletions
T2  - Journal of Geophysical Research: Space Physics
UR  - http://dx.doi.org/10.1029/2022JA030334
UR  - http://hdl.handle.net/10044/1/100876
VL  - 127
ER  - 

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