Abstract
We show that the level of turbulence in accretion disks can be derived from a self-consistency requirement that the associated effective viscosity should match the instantaneous accretion rate. When turbulence originates in the magnetic shearing instability, the effective kinematic viscosity coefficient is shown to be describable by a Shakura-Sunyaev law with α ≈ 0.04. It is shown that thin disks supported by any turbulence with injection scale of order of the disk thickness, are very low magnetic Reynolds number systems. Turbulent viscosity-driven solutions with negligible field dragging and no emission of cold winds or jets are natural consequences of such regimes. Such disks are shown to expell the magnetic field of the accreting object from their kleplerian regions radially outwards, resulting in a flux distribution in the disk which differs very much from a dipolar one.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Aly, J.J., (1984), On some properties of force-free magnetic fields in infinite regions of space, Astrophys. J., 283, pp. 349–362
Aly, J.J., (1991), How much energy can be stored in three-dimensional force-free magnetic fields?, Astrophys. J., 375, pp. L61-L64
Aly, J.J., (1994), Asymptotic formation of a current sheet in an indefinitely sheared force-free field: an analytical example, Astron. Astrophys., 288, pp. 1012–1020
Balbus, S.A. and Hawley, J.F. (1991), A powerful local shear instability in weakly magnetized disks, Astrophys. J., 376 pp. 214–222
Bardou, A., and Heyvaerts, J., (1995), Interaction of a stellar magnetic field with a turbulent accretion disk, Astron. Astrophys., in press
Bardou, A., Heyvaerts, J. and Priest, E.R., (1996), Magnetic field diffusion in self-consistently turbulent accretion disks, submitted to Astrophys. J.
Blandford, R. D., and Payne, D.G., (1982), Hydromagnetic flows from accretion discs and the production of radio jets, Month. Not. Roy. Astr. Soc., 199, pp. 883–903
Brandenburg, A., Nordlund, A., Stein, R.F. and Torkelsson, U., 1995, Dynamo-generated turbulence and large-scale magnetic fields in keplerian shear flow, Astrophys. J., 446, pp. 741–754
Ferreira, J., and Pelletier, G., 1995, Magnetized accretion-ejection structures III, Astron. Astrophys., 295, pp. 807–832
Hawley, J.F., Gammie, C.F. and Balbus, S.A., (1995) Astrophys. J Local three dimensional magnetohydrodynamic simulation of accretion disks 440, pp. 742–763
Heyvaerts, J., Lasry, J.M., Schatzman, M. and Witomsky, P., 1982 Blowing up of two-dimensional magnetohydrostatic equilibria by an increase of electric current or pressure, Astron. Astrophys 111, pp. 104–112
Heyvaerts, J. and Priest, E.R. (1992) A self-consistent turbulent model for solar coronal heating, Astrophys. J., 390, pp. 297–308
Lovelace, R.V.E., Romanova, M.M., and Bisnovatyi-Kogan, G.S., (1995), Spin up/ spin down of magnetized stars with accretion discs and outflows, Month. Not. Roy. Astr. Soc., 275, pp. 244–254
Lubow, S.H., Papaloizou, J.C.B., and Pringle, J.E., (1994), Magnetic field dragging in accretion disks, Month. Not. Roy. Astr. Soc 267, pp. 235–240
Van Ballegooijen, A.A., (1994), Space Sci. Rev Energy release in stellar magnetospheres, Space Sci. Rev 68, pp. 29–38
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1996 Kluwer Academic Publishers
About this chapter
Cite this chapter
Heyvaerts, J.F., Bardou, A., Priest, E.R. (1996). Interaction of Turbulent Accretion Disks with Embedded Magnetic Fields. In: Tsinganos, K.C. (eds) Solar and Astrophysical Magnetohydrodynamic Flows. NATO ASI Series, vol 481. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0265-7_28
Download citation
DOI: https://doi.org/10.1007/978-94-009-0265-7_28
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6603-7
Online ISBN: 978-94-009-0265-7
eBook Packages: Springer Book Archive