Global vortex systems on standard accretion disc surfaces

Details Global vortex systems on standard accretion disc surfaces Global vortex systems on standard accretion disc surfaces

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.303..792v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 4, pp. 792-796.

Astronomy and Astrophysics

Astronomy

1

Accretion, Accretion Discs, Instabilities, Planetary Systems

Scientific paper

The hydrodynamical global stability of turbulent density-stratified and differentially rotating discs is studied. In the context of the mean-field approach, the small-scale turbulence produces the anisotropic kinetic alpha (AKA) effect, which is shown here to generate global vortices. Different rotation laws and aspect ratios, in particular those of standard accretion Kepler discs and galaxies, are considered. Linear stability analysis yields the AKA effect leading to the self-excitation of large-scale flow patterns. The preferred excitations are non-axisymmetric with an azimuthal wavenumber m=1 and antisymmetric with respect to the disc mid-plane. Therefore, there are both hot and cold spots on each surface of the disc. The vertical flow always crosses the equator so that there is no concentration of dense material.

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