Magnetic loops in accretion disk coronae

Details Magnetic loops in accretion disk coronae Magnetic loops in accretion disk coronae

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...165..120b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 165, no. 1-2, Sept. 1986, p. 120-125.

Astronomy and Astrophysics

Astronomy

14

Accretion Disks, Coronal Loops, Stellar Magnetic Fields, Stellar Rotation, Astronomical Models, Black Holes (Astronomy), Magnetohydrodynamics, Thermal Stability, X Ray Sources

Scientific paper

Differential rotation of a standard accretion disk amplifies the magnetic field. This may result in a magnetic active corona surrounding the disk. In this paper the height and pressure of a disk corona are examined, scaling laws for the magnetic structures are derived and their thermal stability is treated. It is shown that, although the temperature gradients are large, the heat conduction along the field lines is given by the classical Spitzer formula. Using the scaling laws the author constructed a simple model for an accretion disk with a magnetically structured corona, derived characteristic timescales and compared them with the time variability of Cygnus X-1.

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