Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.207..131c&link_type=abstract
In ESA Plasma Astrophys. p 131-138 (SEE N85-22270 12-90)
Astronomy and Astrophysics
Astronomy
1
Accretion Disks, Black Holes (Astronomy), Convection, Stellar Magnetic Fields, Stellar Coronas, Stellar Rotation, Turbulence Effects
Scientific paper
The processes preceding the formation of a hot optically thin corona in the inner region of an accretion disk (IRAD) of some black holes have been studied. In particular, thermal convection in IRAD has been studied in the presence of the differential rotation and toroidal magnetic field; it has been found that the magnetic field suppresses thermal convection only when its pressure becomes comparable with that of radiation. The equations of the turbulent dynamo are used to show that in IRAD, in the main, the toroidal component of a large-scale magnetic field increases, reaching its maximum value in a sufficiently short time. In addition, it is shown that a small-scale magnetic field, appearing as a result of the large-scale magnetic field entanglement by the convective turbulence, remains several times weaker than the toroidal component of the large-scale magnetic field.
Chagelishvili G. D.
Lominadze Jumber G.
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