Global ETD Search
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Showing 1 to 8 of 8 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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Variability of young solar-type stars : Spot cycles, rotation, and active longitudes
… stars are believed to support turbulent dynamos that are able to generate strong and dynamic magnetic fields. When these magnetic fields penetrate the stellar surface, they give rise to directly observable activity phenomena, such as dark spots and line emission from the chromospheric …
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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. …