Dependence of MHD turbulence spectra on the velocity field-magnetic field correlation

Details Dependence of MHD turbulence spectra on the velocity field-magnetic field correlation Dependence of MHD turbulence spectra on the velocity field-magnetic field correlation

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126...51g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 1, Sept. 1983, p. 51-58.

Astronomy and Astrophysics

Astrophysics

146

Correlation Coefficients, Energy Spectra, Magnetohydrodynamic Turbulence, Solar Magnetic Field, Solar Wind Velocity, Magnetohydrodynamic Waves

Scientific paper

Steady-state MHD turbulence with nonzero velocity (v) and magnetic field (b) correlation is investigated using two-point turbulence closure and phenomenological arguments. It is determined that equilibrium spectra have power-laws which may significantly depart from the 3/2 law derived by Kraichnan (1965) for the uncorrelated case. This difference is shown to derive from the broken symmetry between the two fields z(+ or -) = v + or - b when the correlation is non zero. It is shown that, for strong correlations, the spectral index for the total energy spectrum may lie anywhere between 3/2 and 3, depending on the correlation level whose maximum is determined by the molecular dissipation coefficients.

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