AAS 204th Meeting, June 2004
Session 62 Protoplanets, Star Formation and Debris Disks
Poster, Wednesday, June 2, 2004, 10:00am-7:00pm, Ballroom

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[62.22] Dynamos in Disks and Disk Coronae: The Role of the Magnetorotational Instability

E.T. Vishniac (Johns Hopkins University)

The generation of strong large scale magnetic field depends on the generation of a magnetic helicity current by eddy scale turbulence. We give a quasilinear estimate of the magnetic helicity current driven by the magnetorotational instability in an accretion disk. We compare the fluid and kinetic limits of this process and show that in both cases a dynamo is expected. This implies that accretion disk coronae and advective accretion solutions can generate large scale magnetic fields, and release gravitational energy through the magnetorotational instability.

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