Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"dynamo theory"”.
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Cio-cio-san no yuutsu: memoirs of magnetogenesis and turbulent dynamo theory
… and density. The dependence of the onset of dynamo action on various values of the magnetic Reynolds- and Prandtl numbers for the cases of the Roberts Flow kinematic dynamo and a flow that, in turn, incorporates both a non-helical and helical forcing function that introduces turbulence into …
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Cio-cio-san no Yūutsu: memoirs of magnetogenesis and Turbulent Dynamo Theory
… and density. The dependence of the onset of dynamo action on various values of the magnetic Reynolds- and Prandtl numbers for the cases of the Roberts Flow kinematic dynamo and a flow that, in turn, incorporates both a non-helical and helical forcing function that introduces turbulence into …
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Magnetic Field Evolution in Black Hole Accretion Disks and Relativistic Jets
… I additionally perform a minor study of the disk dynamo, covered in Chapter 3. Using mean-field dynamo theory, I calculate the diagonal, symmetric α_ij components under both a global azimuthal average and a local Gaussian filter average, finding that local averaging returns more robust numerical …
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Interstellar turbulence driven by magneto-rotational instability
… using massive parallelization. The alpha-Omega dynamo is known to be one of the most efficient mechanisms to reproduce the observed global galactic fields. The presence of strong turbulence is a pre-requisite for the alpha-Omega dynamo generation of the regular magnetic fields. The observed …
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Scale selection in hydromagnetic dynamos
… turbulent convection that ultimately powers the dynamo. Motivated by the scale separation considerations, in this thesis we study the parametric scale selection of dynamo action. Although helioseismology has made a lot of progress in the study of the solar interior, the precise motions of plasma …
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Dynamics of the rise of magnetic flux tubes in stellar interiors
In sonnenähnlichen Sternen erhält ein Dynamo-Mechanismus die Magnetfelder. Der Babcock-Leighton-Dynamo beruht auf einem solchen Mechanismus und erfordert insbesondere die Existenz von magnetischen Flussröhren. Man nimmt an, dass magnetische Flussröhren am Boden der Konvetionszone entstehen und …
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Shearing waves and the MRI dynamo in stratified accretion discs
… local simulations of the MRI have shown that the dynamo changes character on addition of vertical stratification. We investigate numerically 3D hydrodynamic shearing waves with a conserved Hermitian form in an isothermal disc with vertical gravity, and describe the associated symplectic structure. …