Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319.1039r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 4, pp. 1039-1046.
Astronomy and Astrophysics
Astronomy
2
Accretion, Accretion Discs, Magnetic Fields, Mhd, Ism: Jets And Outflows
Scientific paper
In the light of recent results from numerical simulations of accretion disc MHD turbulence, we revisit the problem of the configuration of large-scale magnetic fields resulting from an αΩ dynamo operating in a thin accretion disc. In particular, we analyse the consequences of the peculiar sign of the α-effect suggested by numerical simulations. We determine the symmetry of the fastest-growing modes in the kinematic dynamo approximation and, in the framework of an `α-quenched' dynamo model, study the evolution of the magnetic field. We find that the resulting field for this negative polarity of the α-effect generally has dipole symmetry with respect to the disc midplane, although the existence of an equilibrium configuration depends on the properties of the turbulence. The role of magnetic field dragging is discussed and, finally, the presence of an external uniform magnetic field is included to address the issue of magneto centrifugal wind launching from accretion discs.
No associations
LandOfFree
An unconventional accretion disc dynamo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An unconventional accretion disc dynamo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An unconventional accretion disc dynamo will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1053180