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Magneto-immutable turbulence in weakly collisional plasmas.

J Squire1,2, A A Schekochihin3,4, E Quataert5

  • 1Physics Department, University of Otago, 730 Cumberland St., Dunedin 9016, New Zealand.

Journal of Plasma Physics
|February 9, 2022
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Weakly collisional plasmas develop "magneto-immutability," resisting magnetic field changes. This self-organization, driven by pressure anisotropy, is key for understanding high-beta turbulent plasmas like the solar wind.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • Fluid Dynamics

Background:

  • Turbulent plasmas exhibit complex behaviors influenced by pressure and magnetic fields.
  • Understanding collisionless plasma dynamics is crucial for astrophysical phenomena.
  • High-beta plasmas, where plasma pressure dominates magnetic pressure, are prevalent in space.

Purpose of the Study:

  • To introduce and define the concept of "magneto-immutability" in weakly collisional turbulent plasmas.
  • To investigate the self-organization mechanisms driven by pressure anisotropy.
  • To explore the implications of this effect for high-beta plasmas and the solar wind.

Main Methods:

  • Theoretical proposal of magneto-immutability.
  • Numerical simulations of magnetized turbulence using the weakly collisional Braginskii model.

Main Results:

  • Pressure anisotropy causes turbulent plasmas to self-organize, resisting magnetic field strength variations.
  • Magneto-immutable turbulence shares statistical similarities with critically balanced MHD turbulence.
  • Flow direction is more constrained, and magnetic energy dominates turbulence in magneto-immutable regimes.

Conclusions:

  • Magneto-immutability is a significant effect in high-beta, weakly collisional plasmas.
  • This phenomenon introduces key differences compared to standard fluid turbulence.
  • The predicted effects should be observable in the turbulent solar wind (beta >= 1).