Umfang:
xviii, 133 Seiten
,
Illustrationen, Diagramme
Inhalt:
We do magnetohydrodynamic (MHD) simulations of local box models of turbulent Interstellar Medium (ISM) and analyse the process of amplification and saturation of mean magnetic fields with methods of mean field dynamo theory. It is shown that the process of saturation of mean fields can be partially described by the prolonged diffusion time scales in presence of the dynamically significant magnetic fields. However, the outward wind also plays an essential role in the saturation in higher SN rate case. Algebraic expressions for the back reaction of the magnetic field onto the turbulent transport coefficients are derived, which allow a complete description of the nonlinear dynamo. We also present the effects of dynamically significant mean fields on the ISM configuration and pressure distribution. We further add the cosmic ray component in the simulations and investigate the kinematic growth of mean fields with a dynamo perspective.
Anmerkung:
Dissertation Universität Potsdam 2018
Weitere Ausg.:
Erscheint auch als Online-Ausgabe Bendre, Abhijit B. Growth and saturation of dynamo in spiral galaxies via direct simulations Potsdam, 2018
Sprache:
Englisch
Schlagwort(e):
Spiralgalaxie
;
Dynamo
;
Magnetohydrodynamik
;
Computersimulation
;
Interstellare Materie
;
Turbulente Strömung
;
Sättigungsmagnetisierung
;
Supernova
;
Nichtlineares dynamisches System
;
Kosmische Strahlung
;
Hochschulschrift
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