Can we look inside a dynamo?

Details Can we look inside a dynamo? Can we look inside a dynamo?

2000-10-04

arxiv.org/abs/astro-ph/0010090v1

Astron.Nachr.321:235-247,2000

Astronomy and Astrophysics

Astrophysics

19 pages, to appear in Astron. Nachr

Scientific paper

10.1002/1521-3994(200011)321:4<2

For a simple spherically symmetric mean-field dynamo model we investigate the possibility of determining the radial dependence of the coefficient $\alpha$. Growth rates for different magnetic field modes are assumed to be known by measurement. An evolutionary strategy (ES) is used for the solution of the inverse problem. Numerically, we find quite different $\alpha$-profiles giving nearly the same eigenvalues. The ES is also applied to find functions $\alpha(r)$ yielding zero growth rates for the lowest four magnetic field modes. Additionally, a slight modification of the ES is utilized for an ''energetic'' optimization of $\alpha^2$-dynamos. The consequences of our findings for inverse dynamo theory and for the design of future dynamo experiments are discussed.

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