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Poster De Conférence Année : 2017

Compressible turbulence in the near-Earth space: energy cascade rate from the MHD tothe sub-ion scales

Fouad Sahraoui
L. Z. Hadid
S. Y. Huang
  • Fonction : Auteur
Sébastien Galtier

Résumé

The role of compressible fluctuations in Hall MHD (HMHD) turbulence is investigated using direct numerical simulations and in-situ spacecraft in the near-Earth space. A focus is put on verifying the new exact third-order law derived recently for compressible isothermal HMHD turbulence (Andrés, Galtier and Sahraoui, 2017). The numerical simulations use a 3D compressible HMHD code in the isothermal limit (gamma = 1) with low sonic Mach numbers (Ms < 1). The main goal is to estimate the energy cascade rate of turbulence over a broad range of scales that span both the inertial and sub-ion (dispersive) ranges. Preliminary comparison with observations from the recently launched multispacecraft NASA/MMS (Magnetospheric MultiScale) mission in the solar wind are made.
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Dates et versions

hal-02861320 , version 1 (08-06-2020)

Identifiants

  • HAL Id : hal-02861320 , version 1

Citer

Nahuel Andrés, Fouad Sahraoui, L. Z. Hadid, S. Y. Huang, Sébastien Galtier. Compressible turbulence in the near-Earth space: energy cascade rate from the MHD tothe sub-ion scales. American Geophysical Union, Fall Meeting 2017, Dec 2017, New Orleans, Louisiane, United States. 11, pp.SH11A-2432, 2017. ⟨hal-02861320⟩
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