Magnetic drift processes in differentially rotating turbulence
V. Urpin 1,2 and
A. Brandenburg 1
Received 27 August 1998 / Accepted 1 March 1999
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.
Key words: accretion, accretion disks Magnetohydrodynamics (MHD) turbulence stars: magnetic fields ISM: magnetic fields
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© European Southern Observatory (ESO) 1999
Online publication: April 28, 1999