Magnetic Field Generation in Accretion Disks

Details Magnetic Field Generation in Accretion Disks Magnetic Field Generation in Accretion Disks

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chee.conf..156v&link_type=abstract

CURRENT HIGH-ENERGY EMISSION AROUND BLACK HOLES . Proceedings of the 2nd KIAS Astrophysics Workshop. Held 3-8 September 2001 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

In its usual form, mean-field dynamo theory ignores the constraints imposed by the conservation of magnetic helicity in conducting fluids. Here I discuss how dynamo theory can be modified to account for this important conservation law, and compare this new theoretical framework with numerical simulations of accretion disks. Among the implications of this work are that differential rotation and the magneto-rotational instability are sufficient to account for an efficient dynamo, so that all strongly ionized accretion disks will support dynamo activity. I conclude by discussing the effects of radiation pressure on the dynamo process and possibility of a relationship between the internal dynamo and the luminosity of the disk jet or wind.

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