Magnetically driven wind from an accretion disk with low-inclination field lines

Details Magnetically driven wind from an accretion disk with low-inclination field lines Magnetically driven wind from an accretion disk with low-inclination field lines

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287...80c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 1, p. 80-86

Astronomy and Astrophysics

Astrophysics

57

Accretion Disks, Astronomical Models, Interstellar Magnetic Fields, Magnetic Field Configurations, Mass Flow, Stellar Winds, Gravitational Fields, Magnetohydrodynamics, Stability

Scientific paper

The inclination of the field lines at the surface of an accretion disk has a strong influence on the nature of the resulting magnetically driven wind. If the field lines are steep, a hot corona must be present to feed the wind, at low inclinations the wind is fed directly from the surface. With a simple model for the field distribution in a disk, we show how the transition between the two regimes takes place. At high inclinations, an ordinary wind of the stellar type results. At low inclinations, a high m-dot wind results with very low terminal speed and highly wound-up field lines. We argue that the latter type of wind will be highly unstable to nonaxisymmetric (Parker type) instabilities, and that it gives rise to a magnetically driven circulation along the disk surface rather than a high-density wind.

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