Super-Exponential Growth of Large Scale Magnetic Fields in Rotating Systems

Details Super-Exponential Growth of Large Scale Magnetic Fields in Rotating Systems Super-Exponential Growth of Large Scale Magnetic Fields in Rotating Systems

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741707v&link_type=abstract

American Astronomical Society, AAS Meeting #217, #417.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We consider the growth of large scale magnetic fields in a periodic box with an imposed shear as a simplified model for the growth of galactic magnetic fields. The simulations show very rapid growth of large scale magnetic fields, driven by the divergence of the induced magnetic helicity flux. We show that this flux is independent of the existence of a large scale field, and that the galactic dynamo will grow to saturation in one kinematic e=folding time. We also show that, in general, there is no purely kinematic regime for alpha-Omega dynamos.

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