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Wave-particle interactions at the Io and Enceladus flux tubes: A high-resolution, in-situ parametric study
Sulaiman, A. H.; Hospodarsky, G. B.; Elliott, S. et al.
2020In AGU Fall Meeting Abstracts
 

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Keywords :
5704 Atmospheres; PLANETARY SCIENCES: FLUID PLANETS; 5724 Interiors; 5737 Magnetospheres; 5749 Origin and evolution
Abstract :
[en] The Juno spacecraft passes through magnetic field lines whose equatorial crossing point is at Io's orbital distance, at least once in each hemisphere around a perijove. Similarly, the Cassini spacecraft crossed those connected to Enceladus' orbits. This enables the first in-situ comparative study between the two systems. The electrodynamic coupling between a dynamic moon and a magnetosphere gives rise to a variety of field and particle phenomena. Here we show evidence of cross-scale wave-particle interactions in Io's flux tube, clearly differentiating between 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 observed ion conics; 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 driving Jupiter's main auroral oval. Key similarities and differences are highlighted to measurements of Enceladus' flux tube by Cassini, and we reveal how the power of their interactions compare.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sulaiman, A. H.
Hospodarsky, G. B.
Elliott, S.
Kurth, W. S.
Gurnett, D. A.
Imai, M.
Allegrini, F.
Bonfond, Bertrand  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Clark, G. B.
Connerney, J. E. P.
Ebert, R. W.
Gershman, D. J.
Hue, V.
Janser, S.
Kotsiaros, S.
Paranicas, C.
Santolik, O.
Saur, J.
Szalay, J. R.
Bolton, S. J.
More authors (10 more) Less
Language :
English
Title :
Wave-particle interactions at the Io and Enceladus flux tubes: A high-resolution, in-situ parametric study
Publication date :
2020
Event name :
AGU Fall Meeting
Event date :
du 1 au 17 décembre 2020
Audience :
International
Main work title :
AGU Fall Meeting Abstracts
Pages :
P005-0006
Commentary :
2020
Available on ORBi :
since 18 August 2021

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