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Article Dans Une Revue Geophysical Research Letters Année : 2023

Trapped and Leaking Energetic Particles in Injection Flux Tubes of Saturn's Magnetosphere

Ze-Fan Yin
  • Fonction : Auteur
Yi-Xin Sun
  • Fonction : Auteur
Xu-Zhi Zhou
  • Fonction : Auteur
Dong-Xiao Pan
  • Fonction : Auteur
Zhong-Hua Yao
  • Fonction : Auteur
Chao Yue
  • Fonction : Auteur
Ze-Jun Hu
  • Fonction : Auteur
Elias Roussos
  • Fonction : Auteur
Hai-Rong Lai
  • Fonction : Auteur
Qiu-Gang Zong
  • Fonction : Auteur

Résumé

In Saturn's magnetosphere, the radially-inward transport of magnetic fluxes is usually carried by localized flux tubes with sharply-enhanced equatorial magnetic fields. The flux tubes also bring energetic particles inward, which are expected to drift azimuthally and produce energy-dispersive signatures. Spacecraft observations, however, indicate the occurrence of energy-dispersionless signatures for perpendicular-moving particles. These unexpected features are attributed to the sharp magnetic gradient at the edge of the flux tubes, which significantly modifies the drift trajectories of perpendicular-moving particles to enable their trapping motion within the flux tubes. The bouncing particles are less affected by the gradient, and therefore, still display energy-dispersive signatures. It is the distinct particle behavior, together with different spacecraft traversal paths, that underlies the observational diversity. The results improve our understanding of particle dynamics in the magnetospheres of giant planets and indicate that pitch-angle information should be considered in the extraction of flux-tube properties from energetic particle observations.
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Dates et versions

insu-04473144 , version 1 (23-02-2024)

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Ze-Fan Yin, Yi-Xin Sun, Xu-Zhi Zhou, Dong-Xiao Pan, Zhong-Hua Yao, et al.. Trapped and Leaking Energetic Particles in Injection Flux Tubes of Saturn's Magnetosphere. Geophysical Research Letters, 2023, 50, ⟨10.1029/2023GL105687⟩. ⟨insu-04473144⟩
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