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Article Dans Une Revue Physics of Plasmas Année : 2017

Interplay between Alfvén and magnetosonic waves in compressible magnetohydrodynamics turbulence

Nahuel Andrés
  • Fonction : Auteur
P. Clark Di Leoni
  • Fonction : Auteur
P. Dmitruk
  • Fonction : Auteur
Fouad Sahraoui
W. H. Matthaeus
  • Fonction : Auteur

Résumé

Using spatio-temporal spectra, we show direct evidence of excitation of magnetosonic and Alfvén waves in three-dimensional compressible magnetohydrodynamic turbulence at small Mach numbers. For the plasma pressure dominated regime, or the high beta regime (with beta the ratio between fluid and magnetic pressure), and for the magnetic pressure dominated regime, or the low beta regime, we study magnetic field fluctuations parallel and perpendicular to a guide magnetic field B0. In the low beta case, we find excitation of compressible and incompressible fluctuations, with a transfer of energy towards Alfvénic modes and to a lesser extent towards magnetosonic modes. In particular, we find signatures of the presence of fast magnetosonic waves in a scenario compatible with that of weak turbulence. In the high beta case, fast and slow magnetosonic waves are present, with no clear trace of Alfvén waves, and a significant part of the energy is carried by two-dimensional turbulent eddies.

Dates et versions

hal-01895696 , version 1 (15-10-2018)

Identifiants

Citer

Nahuel Andrés, P. Clark Di Leoni, P. D. Mininni, P. Dmitruk, Fouad Sahraoui, et al.. Interplay between Alfvén and magnetosonic waves in compressible magnetohydrodynamics turbulence. Physics of Plasmas, 2017, 24, pp.102314. ⟨10.1063/1.4997990⟩. ⟨hal-01895696⟩
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