Year: 2000
Type: article
Abstract: For a simple spherically symmetric mean-field dynamo model we investigate the possibility of determining the radial dependence of the coefficient α. 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 α-profiles giving nearly the same eigenvalues. The ES is also applied to find functions α(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 α2-dynamos. The consequences of our findings for inverse dynamo theory and for the design of future dynamo experiments are discussed.
Source: Astronomische Nachrichten
Authors: F. Stefani, G. Gerbeth
Institution: Helmholtz-Zentrum Dresden-Rossendorf
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W2005199386