Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...18911306b&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #113.06; Bulletin of the American Astronomical Society, Vol. 28, p.1426
Astronomy and Astrophysics
Astronomy
Scientific paper
First, a modelisation of turbulence in accretion disks is made using the macroscopic argument that the turbulence level must be such that it adjusts the accretion rate of matter. In such a case, the obtained viscosity law is comparable to the alpha -prescription of Shakura & Sunyaev with alpha = 0.04. Then, the interaction between a turbulent accretion disk and a stellar magnetic field is studied. This interaction leads to a very large inflation and expulsion of the non-magnetospheric magnetic flux (magnetic flux threading the disk) towards larger radii. This inflation is demonstrated using three different and complementary methods. First a constraint on the magnetic flux distribution is obtained analytically. Then, a numerical calculation stresses the amplitude of the phenomenon. Finally, a self-similar calculation of the magnetic configuration is made. The work will be extended to the boundary layer between the magnetopause and the disk.
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