Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations

Abstract We report in situ evidence for Enceladus' Alfvén wing system and its coupling with Saturn's ionosphere, based on multi‐instrument observations from the Cassini spacecraft. Analysis of 36 events, including 13 from non‐flyby paths, confirms the existence of a Main Alfvén Wing (MAW) current system generated at Enceladus, and associated Reflected Alfvén Wings (RAWs) occurring both at Saturn's ionosphere and on the density gradient of Enceladus' plasma torus, extending longitudinally to at least (2,000 moon radii) downstream of the moon. Additionally, the observations reveal the systematic existence of a filamentation process of these large‐scale Alfvénic perturbations (MAW and RAWs) during their propagation at any distance from their source. These findings demonstrate a more extensive electrodynamic coupling than previously reported for Enceladus and more generally for any moon‐magnetosphere interaction. Moreover, the observation of energetic electron depletions and water‐group ion signatures at longitudes even further from the moon supports the interpretation of an extended and persistent interaction region. These results highlight Enceladus' role in shaping Saturn's magnetospheric environment and underscore the importance of future missions to exhaustively analyze this type of complex interaction between a moon and a planet.

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Journal
Journal of Geophysical Research Space Physics
Published
2026-02-01
DOI
https://doi.org/10.1029/2025ja034657
Primary Topic
Astro and Planetary Science
Type
article
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article

Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations

Omakshi Agiwal, Stavros Kotsiaros, Konstantin Kim, Huawen Cao et al.
Journal of Geophysical Research Space Physics
Astro and Planetary Science
article

Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations

Omakshi Agiwal, Stavros Kotsiaros, Konstantin Kim, Huawen Cao, Ronan Modolo, Alexis Jeandet, Sae Aizawa, J. Rabia, T. Chust, J.‐E. Wahlund, O. Witasse, Q. Nénon, L. Lamy, A. Parsec‐Wallis, W. S. Kurth, N. André, P. Canu, M. K. G. Holmberg, C. F. Bowers, X. Jia, M. W. Morooka, M. K. Dougherty, N. J. T. Edberg, A. J. Coates, L. Z. Hadid, G. H. Jones, A. M. Rymer
article en

Abstract

Abstract We report in situ evidence for Enceladus' Alfvén wing system and its coupling with Saturn's ionosphere, based on multi‐instrument observations from the Cassini spacecraft. Analysis of 36 events, including 13 from non‐flyby paths, confirms the existence of a Main Alfvén Wing (MAW) current system generated at Enceladus, and associated Reflected Alfvén Wings (RAWs) occurring both at Saturn's ionosphere and on the density gradient of Enceladus' plasma torus, extending longitudinally to at least (2,000 moon radii) downstream of the moon. Additionally, the observations reveal the systematic existence of a filamentation process of these large‐scale Alfvénic perturbations (MAW and RAWs) during their propagation at any distance from their source. These findings demonstrate a more extensive electrodynamic coupling than previously reported for Enceladus and more generally for any moon‐magnetosphere interaction. Moreover, the observation of energetic electron depletions and water‐group ion signatures at longitudes even further from the moon supports the interpretation of an extended and persistent interaction region. These results highlight Enceladus' role in shaping Saturn's magnetospheric environment and underscore the importance of future missions to exhaustively analyze this type of complex interaction between a moon and a planet.

Journal of Geophysical Research Space PhysicsVol. 131(2)
Boston University (US), Uppsala University (SE), University of Iowa (US), Centre National de la Recherche Scientifique (FR), Planetary Science Institute (US), Dublin Institute For Advanced Studies (IE), Swedish Institute of Space Physics (SE), Université Toulouse III - Paul Sabatier (FR), École Polytechnique (FR), Université de Versailles Saint-Quentin-en-Yvelines (FR), Université Paris Cité (FR), Aix-Marseille Université (FR), Université Paris-Saclay (FR), University of Michigan (US), Johns Hopkins University Applied Physics Laboratory (US), Sorbonne Université (FR), Sorbonne Paris Cité (FR), European Space Astronomy Centre (ES), Institut Pierre-Simon Laplace (FR), Max Planck Institute for Solar System Research (DE), National Higher French Institute of Aeronautics and Space (FR), Czech Academy of Sciences, Institute of Atmospheric Physics (CZ), Laboratoire de Physique des Plasmas (FR), Laboratoire atmosphères, milieux, observations spatiales (FR), Institut de Recherche en Astrophysique et Planétologie (FR), European Space Research and Technology Centre (NL), University College London (GB), Imperial College London (GB)
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