Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..494k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 494-498.
Astronomy and Astrophysics
Astrophysics
45
Isotropic Turbulence, Magnetohydrodynamic Turbulence, Solar Magnetic Field, Dynamo Theory, Nonuniform Plasmas
Scientific paper
We consider the magnetic field transport by turbulence in inhomogeneous fluids taking into account the feedback of magnetic field on the motion. The magnetic influence on locally isotropic turbulence of density-stratified fluids enables the turbulence to advect the mean field. The effect is formally similar to magnetic buoyancy, which has also no linear counterpart. The 'turbulent buoyancy', however, has no definite sign. It is 'almost always' directed upwards for weak magnetic fields but acts downwards in the strong-field limit when the turbulence is close to two-dimensionality. The non-linear regime of the already known diamagnetic transport due to non-uniform intensity in the turbulence field is also considered. The corresponding velocity is found to decrease monotonically with the field strength and becomes negligible in the strong-field case. A comparison with the so far discussed magnetic buoyancy effect shows the necessity of the treatment of the overall field-advection problem.
Kichatinov L. L.
Ruediger Guenther
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