Multiple time scales in anisotropic magnetohydrodynamics

Details Multiple time scales in anisotropic magnetohydrodynamics Multiple time scales in anisotropic magnetohydrodynamics

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..414..235k&link_type=abstract

The workshop on two-dimensional turbulence in plasmas and fluids. AIP Conference Proceedings, Volume 414, pp. 235-242 (1997).

Computer Science

Magnetohydrodynamic And Fluid Equation, Plasma Turbulence

Scientific paper

The consequences of a multiple time-scale resonance theory of magnetohydrodynamics with a strong (vertical) background field are examined and compared with direct numerical solutions at high Reynolds number. The background field defines a characteristic wavenumber kL. Modes with vertical wavenumber above kL are passively driven by the k=0 mode, even when the majority of the energy is contained in the passive wavenumbers. The passive modes do not cascade to higher vertical wavenumbers, so the vertical wavenumber spectrum is not a power law and does not extend to dissipation scales. The k=0 mode evolves with two-dimensional dynamics, forming coherent current structures which are mirrored by the passive modes.

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