On the Generation of Organized Magnetic Fields

Details On the Generation of Organized Magnetic Fields On the Generation of Organized Magnetic Fields

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...728..153t&link_type=abstract

The Astrophysical Journal, Volume 728, Issue 2, article id. 153 (2011).

Astronomy and Astrophysics

Astronomy

2

Dynamo, Magnetic Fields, Magnetohydrodynamics: Mhd

Scientific paper

Motivated by the problem of the origin of astrophysical magnetic fields, we introduce two concepts. The first is that of a "system-scale dynamo", i.e., a dynamo that can organize magnetic fields on the scale of the astrophysical object. The second is that of an "essentially nonlinear dynamo". This is a dynamo which relies on a velocity driven by magnetic forces and/or magnetic instabilities. We construct a simple framework that can be used to study such dynamos and give examples in which the evolution is such to generate a system-scale field. We argue that this framework provides a valuable complementary approach to the more conventional studies based on kinematic mean-field dynamo theory.

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