Three-Dimensional Global MHD Simulations of a Torus Threaded by Toroidal Magnetic Fields

Details Three-Dimensional Global MHD Simulations of a Torus Threaded by Toroidal Magnetic Fields Three-Dimensional Global MHD Simulations of a Torus Threaded by Toroidal Magnetic Fields

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..245m&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Physics

Scientific paper

We present the results of three-dimensional global magnetohydrodynamic(MHD) simulations of a torus threaded by toroidal magnetic fields. An equilibrium model of magnetized torus is adopted as the initial condition. After several rotation period, the inner region of the torus becomes turbulent due to the growth of the magneto rotational instability. Owing to the efficient angular momentum re-distribution, the torus becomes flattened and matter accretes to the central object. We found that when the initial magnetic field is strong (β=Pgas/Pmag ~1), magnetic field remains in the state of β ~1-10. Furthermore, filamentary shaped strongly magnetized regions appear in the torus. The volume filling factor of the region where β < 0.3 is 3-5 %.

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