What is it about?
Results from non linear MHD dynamo experiments with a three-dimensional steady and smooth flow that drives fast dynamo action. This dynamo has a high growth rate in the linear regime, and that it can saturate at a level significantly higher than intermittent turbulent dynamos, namely at energy equipartition.
Why is it important?
Strong magnetic fields, in near equipartition, can be generated also by a non-turbulent dynamo. A striking result is that the saturation state of this dynamo reveals interesting transitions between turbulent and laminar states.
Read the Original
This page is a summary of: Nonlinear MHD dynamo operating at equipartition, Astronomy and Astrophysics, July 2007, EDP Sciences, DOI: 10.1051/0004-6361:20065087.
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On the Saturation of Astrophysical Dynamos
The paper illustrates that even a very symmetric flow of plasma with zero helicity - called the no-cosines flow - can drive a fast dynamo, i.e. that even a simple flow can amplify an initially weak magnetic field
Magnetic activity in late-type giant stars
Numerical MHD simulations of non-linear dynamo action in Betelgeuse
A nonlinear MHD dynamo operating at equipartition
Image at Figshare
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