Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.315..762s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 315, Issue 4, pp. 762-766.
Astronomy and Astrophysics
Astronomy
11
Accretion, Accretion Discs, Magnetic Fields, Mhd
Scientific paper
The presence of an imposed vertical magnetic field may drastically influence the structure of thin accretion discs. If the field is sufficiently strong, the rotation law can depart from the Keplerian one. We consider the structure of a disc for a given eddy magnetic diffusivity but neglect details of the energy transport. The magnetic field is assumed to be in balance with the internal energy of the accretion flow. The thickness of the disc as well as the turbulent magnetic Prandtl number and the viscosity, α, are the key parameters of our model. The calculations show that the radial velocity can reach the sound speed for a magnetic disc if the thickness is comparable to that of a non-magnetic one. This leads to a strong amplification of the accretion rate for a given surface density. The inclination angle of the magnetic field lines can exceed the critical value 30° (required to launch cold jets) even for a relatively small magnetic Prandtl number of order unity. The toroidal magnetic fields induced at the disc surface are smaller than predicted in previous studies.
Rudiger Günther
Shalybkov Dima
No associations
LandOfFree
Magnetic field dragging and the vertical structure of thin accretion discs 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 Magnetic field dragging and the vertical structure of thin accretion discs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic field dragging and the vertical structure of thin accretion discs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1476676