Universität zu Köln

Sulaiman, A. H., Mauk, B. H., Szalay, J. R., Allegrini, F., Clark, G., Gladstone, G. R., Kotsiaros, S., Kurth, W. S., Bagenal, F., Bonfond, B., Connerney, J. E. P., Ebert, R. W., Elliott, S. S., Gershman, D. J., Hospodarsky, G. B., Hue, V, Lysak, R. L., Masters, A., Santolik, O., Saur, J. and Bolton, S. J. (2022). Jupiter's Low-Altitude Auroral Zones: Fields, Particles, Plasma Waves, and Density Depletions. J. Geophys. Res-Space Phys., 127 (8). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9402

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Abstract

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 H-3(+) 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. Alfvenic 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, Alfvenic dissipation, and radio wave generation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sulaiman, A. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mauk, B. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Szalay, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Allegrini, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gladstone, G. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kotsiaros, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurth, W. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bagenal, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonfond, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Connerney, J. E. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ebert, R. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Elliott, S. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gershman, D. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hospodarsky, G. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hue, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Lysak, R. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Masters, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Santolik, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bolton, S. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-695762
DOI:	10.1029/2022JA030334
Journal or Publication Title:	J. Geophys. Res-Space Phys.
Volume:	127
Number:	8
Date:	2022
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-9402
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FAST SATELLITE-OBSERVATIONS; ION-CYCLOTRON WAVES; MIDDLE MAGNETOSPHERE; ALIGNED CURRENTS; SOLITARY WAVES; ELECTRON-BEAMS; POLAR-REGIONS; ACCELERATION; RADIATION; OVAL Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69576