Monday, June 2, 2014 - 11:00am
Jennifer Schober (ZAH/ITA):
"Saturation and Efficiency of the Turbulent Dynamo"
Abstract. Magnetic fields are ubiquitous in the present-day Universe. The high field strengths result probably from weak seed fields that have been amplified by magnetohydrodynamical dynamos. In my talk I will summarize the main properties of the turbulent small-scale dynamo, which amplifies magnetic fields by randomly stretching, twisting and folding the field lines. I will focus on the saturation process that can be modelled theoretically via an increasing magnetic Reynolds number. With a simple model for the evolution of the turbulent and magnetic energy spectra, we can estimate the amount of turbulent kinetic energy that is converted into magnetic energy by small-scale dynamo action.