Journal article
Wave‐Particle Interactions Associated With Io's Auroral Footprint: Evidence of Alfvén, Ion Cyclotron, and Whistler Modes
Geophysical research letters, Vol.47(22), pp.2020-n/a
11/28/2020
DOI: 10.1029/2020GL088432
Abstract
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 Alfvén waves undergoing a turbulent cascade, suggesting Alfvénic 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, https://doi.org/10.1029/2020GL090839); 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.
Key Points
Juno observes wave and particle phenomena associated with Io's auroral footprint
Alfvénic acceleration was indicated by observations of magnetic turbulence and broadband electron distributions
Intense ion cyclotron and whistler‐mode radiations are related to auroral ions and electrons, respectively
Details
- Title: Subtitle
- Wave‐Particle Interactions Associated With Io's Auroral Footprint: Evidence of Alfvén, Ion Cyclotron, and Whistler Modes
- Creators
- A. H. Sulaiman - University of IowaG. B. Hospodarsky - University of IowaS. S. Elliott - University of IowaW. S. Kurth - University of IowaD. A. Gurnett - University of IowaM. Imai - University of IowaF. Allegrini - The University of Texas at San AntonioB. Bonfond - University of LiègeG. Clark - Johns Hopkins University Applied Physics LaboratoryJ. E. P. Connerney - Goddard Space Flight CenterR. W. Ebert - The University of Texas at San AntonioD. J. Gershman - Goddard Space Flight CenterV. Hue - Southwest Research InstituteS. Janser - University of CologneS. Kotsiaros - Technical University of DenmarkC. Paranicas - Johns Hopkins University Applied Physics LaboratoryO. Santolík - Charles UniversityJ. Saur - University of CologneJ. R. Szalay - Princeton UniversityS. J. Bolton - Southwest Research Institute
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.47(22), pp.2020-n/a
- DOI
- 10.1029/2020GL088432
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 10
- Grant note
- Praemium Academiae Award NASA (699041X) LTAUSA17070 project
- Language
- English
- Date published
- 11/28/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455549702771
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