Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...342..892r&link_type=abstract
Astronomy and Astrophysics, v.342, p.892-900 (1999)
Astronomy and Astrophysics
Astrophysics
6
Accretion, Accretion Disks, Mhd
Scientific paper
We investigate the generation of a large-scale magnetic field by an alpha Omega -dynamo in turbulent accretion disks surrounded by linear force-free coronae. The standard alpha -disk model with parameters relevant to a typical disk around a compact star is assumed. The dynamo-generated magnetic field is calculated in both kinematic and nonlinear regimes. The critical dynamo number is D_c ~ 10 and the lowest normal mode has a quadrupole symmetry, just like dynamo models calculated for disks surrounded by a vacuum. The equilibrated magnetic field also has quadrupole symmetry and its distribution inside the disk is almost the same as in a disk with vacuum exterior. The novel feature is the existence of a toroidal field in the exterior of the disk which, permits the corona to transmit magnetic stresses between the inner and outer parts of the disk. However, all dynamical effects of the large-scale magnetic fields are small, due to the restricted magnitude and the specific configuration of the magnetic field generated by the alpha Omega -dynamo.
Reyes-Ruiz Mauricio
Stepinski Tomasz F.
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