Magnetic drift processes in differentially rotating turbulence

Details Magnetic drift processes in differentially rotating turbulence Magnetic drift processes in differentially rotating turbulence

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345.1054u&link_type=abstract

Astronomy and Astrophysics, v.345, p.1054-1058 (1999)

Astronomy and Astrophysics

Astrophysics

3

Accretion, Accretion Disks, Magnetohydrodynamics (Mhd), Turbulence, Stars: Magnetic Fields, Ism: Magnetic Fields

Scientific paper

The mean electromotive force is considered in a differentially rotating fluid taking into account stretching of the turbulent magnetic field. Calculations are performed by making use of the second order correlation approximation. Non-uniformity of the angular velocity leads to specific drift processes in the azimuthal direction. Due to this drift the magnetic field can rotate with a somewhat different angular velocity than the fluid. Differential rotation can also lead in a new instability of a non-axisymmetric mean field. Regardless of the law of the differential rotation this instability can result in an exponential amplification of the field.

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