On the saturation of astrophysical dynamos: Numerical experiments with the no-cosines flow

Bertil Dorch, Vasilis Archontis

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Abstrakt

In the context of astrophysical dynamos we illustrate that the no-cosines flow, with zero mean helicity, can drive fast dynamo action and we study the dynamo's mode of operation during both the linear and non-linear saturation regimes. It turns out that in addition to a high growth rate in the linear regime, the dynamo saturates at a level significantly higher than normal turbulent dynamos, namely at exact equipartition when the magnetic Prandtl number Prm~ 1. Visualization of the magnetic and velocity fields at saturation will help us to understand some of the aspects of the non-linear dynamo problem.
Udgivelsesdato: 2 May
OriginalsprogEngelsk
TidsskriftSolar Physics
Vol/bind224
Udgave nummer1-2
Sider (fra-til)171-178
ISSN0038-0938
DOI
StatusUdgivet - 2004
Udgivet eksterntJa

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