[Todos] Coloquios del Departamento de Física

[Pablo Dmitruk]

--------------------------------------------------------------------------

                  COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEyN - UBA


                              Charla, café y galletitas
                         En el Aula Federman, 1er piso Pabellón I,
                                 Ciudad Universitaria


           Galactic magnetic fields: how they grow, saturate and dissipate

                  El próximo jueves 10 de diciembre a las 14 hs

                                 Fabio Del Sordo

                                 NORDITA, Suecia



The galactic dynamo is believed to be powered by supernova-driven  
turbulence. This type of forcing does not directly produce vorticity.  
The aim of this work is to assess whether vorticity is actually  
important for the dynamo. We review how galactic magnetic fields can  
grow with alpha effect and we show some of the problems that could  
arise in doing simulations of such a field. Then we briefly talk about  
magnetic helicity and how this can control the evolution of magnetic  
structures. In the end we get closer to galactic magnetic fields and  
relate their existence to the presence of vorticity in the turbulence  
of the galactic medium.