Accretion-Ejection Instability in Magnetized Disks

Details Accretion-Ejection Instability in Magnetized Disks Accretion-Ejection Instability in Magnetized Disks

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.437t&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We show that disks threaded by a vertical magnetic field are subject to an instability connecting accretion with ejection. The instability consists mainly in a spiral density wave, similar to galactic spirals but driven by long-range magnetic stresses rather than self-gravity. The spiral is unstable by depositing energy and angular momentum, extracted from the disk (where it causes accretion), in a Rossby vortex at its corotation radius. If the disk posseses a low-mass corona, the vortex can the ``leak'' the angular momentum to an Alfven wave emitted along the field lines toward the corona, where it can power an outflow.

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