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Communication Dans Un Congrès Année : 2022

Inhomogeneous Distribution of High-Amplitude Kinetic Alfvén Waves in the Near-Sun Solar Wind

David Malaspina
  • Fonction : Auteur
Alexandros Chasapis
  • Fonction : Auteur
Peter Tatum
  • Fonction : Auteur
Chadi S. Salem
  • Fonction : Auteur
Stuart D. Bale
  • Fonction : Auteur
John W. Bonnell
  • Fonction : Auteur
Keith Goetz
  • Fonction : Auteur
Marc Pulupa
  • Fonction : Auteur
Jasper S. Halekas
  • Fonction : Auteur
Phyllis L. Whittlesey
  • Fonction : Auteur
Roberto Livi
  • Fonction : Auteur
Anthony W. Case
  • Fonction : Auteur
Michael Louis Stevens
  • Fonction : Auteur
Davin E. Larson
  • Fonction : Auteur

Résumé

The near-Sun solar wind (sunward of 0.25 AU) is found to contain many intervals of high-amplitude electromagnetic broadband plasma waves. These waves are identified as kinetic Alfvén waves (KAWs) based on variation in their electric to magnetic field ratio and magnetic compressibility as a function of frequency. A key difference between these KAWs and KAWs observed near 1 AU is that the near-Sun high-amplitude KAWs are distributed unevenly in space, most often occurring where the ambient magnetic field deviates from the Parker spiral direction, including during magnetic switchbacks. Because small-scale turbulent fluctuations in the solar wind are often characterized as KAWs, these observations suggest that turbulent dissipation and heating via KAW fluctuations should also be spatially inhomogeneous in the near-Sun solar wind, maximizing in regions of high-amplitude KAWs. Also, a deviation between the observed KAWs and theoretical KAW behavior is observed at the smallest fluctuation scales. Possible origins of this deviation are explored.
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Dates et versions

insu-04089874 , version 1 (05-05-2023)

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David Malaspina, Alexandros Chasapis, Peter Tatum, Chadi S. Salem, Stuart D. Bale, et al.. Inhomogeneous Distribution of High-Amplitude Kinetic Alfvén Waves in the Near-Sun Solar Wind. AGU Fall Meeting 2022, 2022, à renseigner, Unknown Region. ⟨insu-04089874⟩
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