Observations of Whistler Waves Correlated with Electron-scale Coherent Structures in the Magnetosheath Turbulent Plasma - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2018

Observations of Whistler Waves Correlated with Electron-scale Coherent Structures in the Magnetosheath Turbulent Plasma

S. Y. Huang
  • Fonction : Auteur
Fouad Sahraoui
Z. G. Yuan
  • Fonction : Auteur
Olivier Le Contel
J. S. He
  • Fonction : Auteur
J. S. Zhao
  • Fonction : Auteur
H.S. Fu
  • Fonction : Auteur
M. Zhou
X. H. Deng
  • Fonction : Auteur
X. Y. Wang
  • Fonction : Auteur
J. W. Du
  • Fonction : Auteur
X. D. Yu
  • Fonction : Auteur
D. D. Wang
  • Fonction : Auteur
R. B. Torbert
  • Fonction : Auteur
J. L. Burch
  • Fonction : Auteur

Résumé

A new type of electron-scale coherent structure, referred to as electron vortex magnetic holes, was identified recently in the Earth's magnetosheath turbulent plasma. These electron-scale magnetic holes are characterized by magnetic field strength depression, electron density enhancement, temperature and temperature anisotropy increase (a significant increase in perpendicular temperature and a decrease in parallel temperature), and an electron vortex formed by the trapped electrons. The strong increase of electron temperature indicates that these magnetic holes have a strong connection with the energization of electrons. Here, using high time resolution in situ measurements from the MMS mission, it is further shown that electron-scale whistler waves coexist with electron-scale magnetic holes. These whistler waves were found not propagating from remote regions, but generated locally due to electron temperature anisotropy (T e⊥/T e||) inside the magnetic holes. This study provides new insights into the electron-scale plasma dynamics in turbulent plasmas.

Dates et versions

hal-02406600 , version 1 (12-12-2019)

Identifiants

Citer

S. Y. Huang, Fouad Sahraoui, Z. G. Yuan, Olivier Le Contel, Hugo Breuillard, et al.. Observations of Whistler Waves Correlated with Electron-scale Coherent Structures in the Magnetosheath Turbulent Plasma. The Astrophysical Journal, 2018, 861, ⟨10.3847/1538-4357/aac831⟩. ⟨hal-02406600⟩
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