Physics – Plasma Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppgi2003b&link_type=abstract
American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre
Physics
Plasma Physics
Scientific paper
The mean field dynamo is a leading framework for understanding the growth of large scale magnetic fields in turbulent astrophysical rotators. Small scale helical motions and large scale shear can in principle drive the field growth. However, traditional kinematic mean field dynamo theory has ignored the backreaction of the growing small and large scale field on the kinetic motions. The extent to which the backreaction suppresses the mean field dynamo has been controversial and recent studies have strongly disagreed. Recognizing the fundamental importance of a magnetic helicity flow and a turbulent cascade in the dynamo process reveals that these conflicting results may be understood. The use of non-periodic boundary conditions and scale separation turn out to be essential when testing dynamo action relevant for astrophysical systems. The physics and implications of magnetic helicity flow and turbulent diffusion for the dynamo, suppression studies, and observed astrophysical systems will be discussed. Important open questions will be highlighted.
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