Wave-Particle Interactions Associated With Io's Auroral Footprint: Evidence of Alfven, Ion Cyclotron, and Whistler Modes

0538242 - ÚFA 2021 RIV US eng J - Journal Article
Sulaiman, A. H. - Hospodarsky, G. B. - Elliott, S.S. - Kurth, W. S. - Gurnett, D. A. - Imai, M. - Allegrini, F. - Bonfond, B. - Clark, G. - Connerney, J. E. P. - Ebert, R. W. - Gershman, D. J. - Hue, V. - Janser, S. - Kotsiaros, S. - Paranicas, C. - Santolík, Ondřej - Saur, J. - Szalay, J.R. - Bolton, S.J.
Wave-Particle Interactions Associated With Io's Auroral Footprint: Evidence of Alfven, Ion Cyclotron, and Whistler Modes.
Geophysical Research Letters. Roč. 47, č. 22 (2020), č. článku e2020GL088432. ISSN 0094-8276. E-ISSN 1944-8007
Grant - others:AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:68378289
Keywords : Alfvén waves * Ion cyclotron waves * Io * Wave-particle interaction * Whistler-mode waves * Jupiter
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 4.720, year: 2020
Method of publishing: Limited access
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL088432

The electrodynamic coupling between Io and Jupiter gives rise to wave-particle interactions across multiple spatial scales. Here we report observations during Juno's 12th perijove (PJ) high-latitude northern crossing of the flux tube connected to Io's auroral footprint. We focus on plasma wave measurements, clearly differentiating between magnetohydrodynamic (MHD), ion, and electron scales. We find (i) evidence of Alfven waves undergoing a turbulent cascade, suggesting Alfvenic acceleration processes together with observations of bi-directional, broadband electrons: (ii) intense ion cyclotron waves with an estimated heating rate that is consistent with the generation of ion conics reported by Clark et al. (2020, ): and (iii) whistler-mode auroral hiss radiation excited by field-aligned electrons. Such high-resolution wave and particle measurements provide an insight into satellite interactions in unprecedented detail. We further anticipate that these spatially well-constrained results can be more broadly applied to better understand processes of Jupiter's main auroral oval.
Permanent Link: http://hdl.handle.net/11104/0316073