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

A. H. Sulaiman, G. B. Hospodarsky, S. S. Elliott, W. S. Kurth, D. A. Gurnett, M. Imai, F. Allegrini, B. Bonfond, G. Clark, J. E.P. Connerney, R. W. Ebert, D. J. Gershman, V. Hue, S. Janser, S. Kotsiaros, C. Paranicas, O. Santolík, J. Saur, J. R. Szalay, S. J. Bolton

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article numbere2020GL088432
JournalGeophysical Research Letters
Volume47
Issue number22
DOIs
StatePublished - Nov 28 2020
Externally publishedYes

Bibliographical note

Funding Information:
The authors gratefully acknowledge J. Faden and the use of Autoplot. The research at the University of Iowa was supported by NASA through Contract 699041X with the Southwest Research Institute. O. S. acknowledges support from the LTAUSA17070 project and from the Praemium Academiae Award.

Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.

Keywords

  • Alfvén waves
  • Io
  • Ion cyclotron waves
  • Jupiter
  • Wave-particle interaction
  • Whistler-mode waves

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