Electron-Driven Dissipation in a Tailward Flow Burst - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2019

Electron-Driven Dissipation in a Tailward Flow Burst

Z. Z. Chen
  • Fonction : Auteur
H.S. Fu
  • Fonction : Auteur
C. M. Liu
  • Fonction : Auteur
T. Y. Wang
  • Fonction : Auteur
R. E. Ergun
  • Fonction : Auteur
S. Y. Huang
  • Fonction : Auteur
Y. V. Khotyaintsev
  • Fonction : Auteur
Olivier Le Contel
B. L. Giles
  • Fonction : Auteur
J. L. Burch
  • Fonction : Auteur

Résumé

Traditionally, the magnetotail flow burst outside the diffusion region is known to carry ions and electrons together (Vi = Ve), with the frozen-in condition well satisfied (E Ve × B = 0). Such picture, however, may not be true, based on our analyses of the high-resolution MMS (Magnetospheric Multiscale mission) data. We find that inside the flow burst the electrons and ions can be decoupled (Ve != Vi), with the electron speed 5 times larger than the ion speed. Such super-Alfvenic electron jet, having scale of 10 di (ion inertial length) in XGSM direction, is associated with electron demagnetization (E Ve × B != 0), electron agyrotropy (crescent distribution), and O-line magnetic topology but not associated with the flow reversal and X-line topology; it can cause strong energy dissipation and electron heating. We quantitatively analyze the dissipation and find that it is primarily attributed to lower hybrid drift waves. These results emphasize the non-MHD (magnetohydrodynamics) behaviors of magnetotail flow bursts and the role of lower hybrid drift waves in dissipating energies.
Fichier non déposé

Dates et versions

hal-02345133 , version 1 (04-11-2019)

Identifiants

Citer

Z. Z. Chen, H.S. Fu, C. M. Liu, T. Y. Wang, R. E. Ergun, et al.. Electron-Driven Dissipation in a Tailward Flow Burst. Geophysical Research Letters, 2019, 46 (11), pp.5698-5706. ⟨10.1029/2019GL082503⟩. ⟨hal-02345133⟩
10 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More