EFDG Colloquium Series Inaugural Lecture: Professor Steve Tobias

So many dynamos: The generation of magnetic fields in planets and stars

Professor Steve Tobias, University of Leeds

Abstract

The generation of magnetic field in Earth's interior and the origin of the eleven year solar cycle are both thought to lie in dynamo action of an electrically
conducting fluid. In both cases fluid motions interact with rotation to sustain electrical currents and hence magnetic field. In this talk I will give an introduction
to some interesting problems for a fluid dynamicist in trying to explain the generation of magnetic field and I will highlight some differences between the geo-
and solar dynamo problems. I'll conclude by drawing an analogy of the geodynamo problem with transition to turbulence in flow down a pipe.

Biography

Steve Tobias’ research is on theoretical and computational fluids and MHD, particularly related to geophysical and astrophysical flows. He completed his PhD
entitled “Nonlinear Solar and Stellar Dynamos” in DAMTP in Cambridge under the supervision of Professor Nigel Weiss in 1995. He was then elected a Research Fellow of Trinity College, Cambridge before becoming a PDRA at the University of Colorado, Boulder from 1996-1998. He returned to Cambridge before moving to Leeds as a lecturer in 2000. He is Professor of Applied Mathematics in Leeds and Director of the Leeds Institute for Fluid Dynamics.