View in EDS

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

Saved in:
Bibliographic Details
Title: Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations.
Authors: Hadid, L. Z.1 (AUTHOR) lina.hadid@lpp.polytechnique.fr, Chust, T.1 (AUTHOR), Wahlund, J.‐E.2 (AUTHOR), Morooka, M. W.2 (AUTHOR), Roussos, E.3 (AUTHOR), Witasse, O.4 (AUTHOR), Rabia, J.5 (AUTHOR), Pisa, D.6 (AUTHOR), Kim, K.2,7 (AUTHOR), Edberg, N. J. T.2 (AUTHOR), Rymer, A. M.8 (AUTHOR), Lamy, L.9,10 (AUTHOR), Kotsiaros, S.11 (AUTHOR), Aizawa, S.1 (AUTHOR), Jeandet, A.1 (AUTHOR), Modolo, R.12 (AUTHOR), André, N.5,13 (AUTHOR), Canu, P.1 (AUTHOR), Bowers, C. F.14 (AUTHOR), Jia, X.14 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Feb2026, Vol. 131 Issue 2, p1-19. 19p.
Subject Terms: Enceladus (Satellite), Plasma Alfven waves, Auroras, Magnetosphere, Electromagnetic coupling
Company/Entity: Cassini (Spacecraft)
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 ∼120° ${\sim} 120{}^{\circ}$ (∼ ${\sim} $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. Plain Language Summary: Saturn's small icy moon Enceladus interacts with the planet's magnetic field, generating intermittent aurora in Saturn's upper atmosphere and electromagnetic waves that travel along invisible magnetic connections between them. During its 13‐year mission, the Cassini spacecraft repeatedly crossed these magnetic field lines linked to Enceladus. We used data from several Cassini instruments to study how energy and particles move between the moon and Saturn. We detected wave activity characteristic of Alfvén waves (similar to vibrations on a string), forming as Saturn's magnetic field flows past Enceladus. Due to a complex system of reflection at both Saturn's ionosphere and the boundary of Enceladus' torus, these waves were found not only near the moon but also trailing far behind it, extending more than 504,000 km (over 2,000 times the moon's radius) behind it. This is the first time that Alfvén waves have been observed to be directly linked to the charged particles associated with Enceladus. This shows that Enceladus plays a much bigger role in shaping Saturn's space environment than previously thought, and reveals how moons can influence their host planet across vast distances. Key Points: Enceladus sustains an extended Alfvén wing system with numerous reflections within its torus and on the kronian ionosphereEnceladus' electromagnetic interaction with Saturn's rotating magnetic field extends up to at least 120° downstream of the moonThe large‐scale Alfvén wing perturbations are systematically filamented during their propagation at any distance from their source [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: GreenFILE
FullText Text:
  Availability: 0
Header DbId: 8gh
DbLabel: GreenFILE
An: 191834851
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Hadid%2C+L%2E+Z%2E%22">Hadid, L. Z.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> lina.hadid@lpp.polytechnique.fr</i><br /><searchLink fieldCode="AR" term="%22Chust%2C+T%2E%22">Chust, T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wahlund%2C+J%2E‐E%2E%22">Wahlund, J.‐E.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Morooka%2C+M%2E+W%2E%22">Morooka, M. W.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Roussos%2C+E%2E%22">Roussos, E.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Witasse%2C+O%2E%22">Witasse, O.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rabia%2C+J%2E%22">Rabia, J.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pisa%2C+D%2E%22">Pisa, D.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+K%2E%22">Kim, K.</searchLink><relatesTo>2,7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Edberg%2C+N%2E+J%2E+T%2E%22">Edberg, N. J. T.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rymer%2C+A%2E+M%2E%22">Rymer, A. M.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lamy%2C+L%2E%22">Lamy, L.</searchLink><relatesTo>9,10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kotsiaros%2C+S%2E%22">Kotsiaros, S.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aizawa%2C+S%2E%22">Aizawa, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jeandet%2C+A%2E%22">Jeandet, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Modolo%2C+R%2E%22">Modolo, R.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22André%2C+N%2E%22">André, N.</searchLink><relatesTo>5,13</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Canu%2C+P%2E%22">Canu, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bowers%2C+C%2E+F%2E%22">Bowers, C. F.</searchLink><relatesTo>14</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jia%2C+X%2E%22">Jia, X.</searchLink><relatesTo>14</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Feb2026, Vol. 131 Issue 2, p1-19. 19p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Enceladus+%28Satellite%29%22">Enceladus (Satellite)</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+Alfven+waves%22">Plasma Alfven waves</searchLink><br /><searchLink fieldCode="DE" term="%22Auroras%22">Auroras</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetosphere%22">Magnetosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+coupling%22">Electromagnetic coupling</searchLink>
– Name: SubjectCompany
  Label: Company/Entity
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Cassini+%28Spacecraft%29%22">Cassini (Spacecraft)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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 ∼120° ${\sim} 120{}^{\circ}$ (∼ ${\sim} $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. Plain Language Summary: Saturn's small icy moon Enceladus interacts with the planet's magnetic field, generating intermittent aurora in Saturn's upper atmosphere and electromagnetic waves that travel along invisible magnetic connections between them. During its 13‐year mission, the Cassini spacecraft repeatedly crossed these magnetic field lines linked to Enceladus. We used data from several Cassini instruments to study how energy and particles move between the moon and Saturn. We detected wave activity characteristic of Alfvén waves (similar to vibrations on a string), forming as Saturn's magnetic field flows past Enceladus. Due to a complex system of reflection at both Saturn's ionosphere and the boundary of Enceladus' torus, these waves were found not only near the moon but also trailing far behind it, extending more than 504,000 km (over 2,000 times the moon's radius) behind it. This is the first time that Alfvén waves have been observed to be directly linked to the charged particles associated with Enceladus. This shows that Enceladus plays a much bigger role in shaping Saturn's space environment than previously thought, and reveals how moons can influence their host planet across vast distances. Key Points: Enceladus sustains an extended Alfvén wing system with numerous reflections within its torus and on the kronian ionosphereEnceladus' electromagnetic interaction with Saturn's rotating magnetic field extends up to at least 120° downstream of the moonThe large‐scale Alfvén wing perturbations are systematically filamented during their propagation at any distance from their source [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=8gh&AN=191834851
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1029/2025JA034657
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 1
    Subjects:
      – SubjectFull: Enceladus (Satellite)
        Type: general
      – SubjectFull: Plasma Alfven waves
        Type: general
      – SubjectFull: Auroras
        Type: general
      – SubjectFull: Magnetosphere
        Type: general
      – SubjectFull: Electromagnetic coupling
        Type: general
      – SubjectFull: Cassini (Spacecraft)
        Type: general
    Titles:
      – TitleFull: Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Hadid, L. Z.
      – PersonEntity:
          Name:
            NameFull: Chust, T.
      – PersonEntity:
          Name:
            NameFull: Wahlund, J.‐E.
      – PersonEntity:
          Name:
            NameFull: Morooka, M. W.
      – PersonEntity:
          Name:
            NameFull: Roussos, E.
      – PersonEntity:
          Name:
            NameFull: Witasse, O.
      – PersonEntity:
          Name:
            NameFull: Rabia, J.
      – PersonEntity:
          Name:
            NameFull: Pisa, D.
      – PersonEntity:
          Name:
            NameFull: Kim, K.
      – PersonEntity:
          Name:
            NameFull: Edberg, N. J. T.
      – PersonEntity:
          Name:
            NameFull: Rymer, A. M.
      – PersonEntity:
          Name:
            NameFull: Lamy, L.
      – PersonEntity:
          Name:
            NameFull: Kotsiaros, S.
      – PersonEntity:
          Name:
            NameFull: Aizawa, S.
      – PersonEntity:
          Name:
            NameFull: Jeandet, A.
      – PersonEntity:
          Name:
            NameFull: Modolo, R.
      – PersonEntity:
          Name:
            NameFull: André, N.
      – PersonEntity:
          Name:
            NameFull: Canu, P.
      – PersonEntity:
          Name:
            NameFull: Bowers, C. F.
      – PersonEntity:
          Name:
            NameFull: Jia, X.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 21699380
          Numbering:
            – Type: volume
              Value: 131
            – Type: issue
              Value: 2
          Titles:
            – TitleFull: Journal of Geophysical Research. Space Physics
              Type: main
ResultId 1