Can a disc dynamo generate large-scale magnetic fields?
نویسندگان
چکیده
منابع مشابه
Can the turbulent galactic dynamo generate large - scale magnetic fields ?
Large-scale magnetic fields in galaxies are thought to be generated by a turbulent dynamo. However the same turbulence also leads to a small-scale dynamo which generates magnetic noise at a more rapid rate. The efficiency of the large-scale dynamo depends on how this noise saturates. We examine this issue taking into account ambipolar drift, which obtains in a galaxy with significant neutral ga...
متن کاملThe magnetic shear-current effect: generation of large-scale magnetic fields by the small-scale dynamo
J. Squire1,3† and A. Bhattacharjee2,3 TAPIR, Mailcode 350-17, California Institute of Technology, Pasadena, CA 91125, USA Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543 Max Planck/Princeton Center for Plasma Physics, Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory, Princeton University, Princet...
متن کاملGeneration of Large-Scale Magnetic Fields by Small-Scale Dynamo in Shear Flows.
We propose a new mechanism for a turbulent mean-field dynamo in which the magnetic fluctuations resulting from a small-scale dynamo drive the generation of large-scale magnetic fields. This is in stark contrast to the common idea that small-scale magnetic fields should be harmful to large-scale dynamo action. These dynamos occur in the presence of a large-scale velocity shear and do not require...
متن کاملSurface appearance of dynamo-generated large-scale fields
Aims. Twisted magnetic fields are frequently seen to emerge above the visible surface of the Sun. This emergence is usually associated with the rise of buoyant magnetic flux structures. Here we ask how magnetic fields from a turbulent large-scale dynamo appear above the surface if there is no magnetic buoyancy. Methods. The computational domain is split into two parts. In the lower part, which ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1996
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/281.1.219