Magnetic field bending in accretion discs with dynamos |
| |
| Authors: | C G Campbell J C B Papaloizou & V Agapitou |
| |
| Institution: | Isaac Newton Institute for Mathematical Sciences, 20 Clarkson Road, Cambridge CB3 0EH,;Department of Mathematics, University of Newcastle upon Tyne, Newcastle NE1 7RU,;Astronomy Unit, Department of Mathematics, Queen Mary and Westfield College, Mile End Road, London E1 4NS |
| |
| Abstract: | We consider the problem of poloidal magnetic field advection and bending of an initially vertical field owing to radial inflow in thin accretion discs. For a ratio of kinematic viscosity to magnetic diffusivity of order unity, significant bending of an externally applied vertical field cannot occur in a disc with no internal dynamo. However, we show that if poloidal field is generated by a dynamo operating near its critical state, then significant field bending may be possible. Our results are of particular relevance to wind launching from accretion discs. |
| |
| Keywords: | accretion accretion discs magnetic fields |
|
|
