Dynamo–generated turbulence and outflows from accretion discs
نویسندگان
چکیده
منابع مشابه
Dynamo-generated turbulence and outflows from accretion discs
Local hydromagnetic simulations of accretion-disc turbulence currently provide the most convincing evidence that the origin of turbulence in discs could be the Balbus{ Hawley magnetorotational instability. The main results of such calculations are highlighted with particular emphasis on the generation of large-scale magnetic elds. Comparison with mean- eld dynamo theory is made. This theory ...
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An e atmosphere is inevitably created around a black hole accretion disc whose spectrum extends to MeV energies. Pairs created in γ − γ collisions outside the disc are blown away by soft radiation (which dominates the bolometric luminosity of the disc) and form a semi-relativistic outflow. We simulate numerically the conversion of the MeV radiation into a vertical e outflow above a disc-like so...
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Accretion disc turbulence is investigated in the framework of the shearing box approximation. The turbulence is either driven by the magneto-rotational instability or, in the non-magnetic case, by an explicit and artificial forcing term in the momentum equation. Unlike the magnetic case, where most of the dissipation occurs in the disc corona, in the forced hydrodynamic case most of the dissipa...
متن کاملDynamo-generated Turbulence and Outtows from Accretion Discs
Local hydromagnetic simulations of accretion disc turbulence provide now the most convincing evidence that the origin of turbulence in discs could be the Balbus{Hawley magneto-rotational instability. The main results of such calculations are highlighted with particular emphasis on the generation of large scale magnetic elds. Comparison with mean-eld dynamo theory is made. This theory is then us...
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ژورنال
عنوان ژورنال: Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
سال: 2000
ISSN: 1364-503X,1471-2962
DOI: 10.1098/rsta.2000.0557