University of Minnesota
Aerospace Engineering and Mechanics
Spring 2003 Seminar Series



Generation of helicity and Reynolds stress by magnetostrophic turbulence

Prof. H Keith Moffatt

Department of Applied Mathematics and Theoretical Physics, Cambridge University


Abstract

Turbulence generated by a random buoyancy field in a rapidly rotating medium permeated by a strong magnetic field is considered. The helicity and the corresponding alpha-effect are calculated, and also the Reynolds stress distribution. These are the essential ingredients for maintenance of the magnetic field (i.e.dynamo action). The spectral properties of this type of turbulence, for which the principal nonlinearity occurs not in the dynamical equation, but rather in the advection-diffusion equation for the buoyancy field, is discussed.

Friday, April 18, 2003
209 Akerman Hall
2:30-3:30 p.m.


Refreshments served after the seminar in 227 Akerman Hall.
Disability accomodations provided upon request.
Contact the AEM Office, 625-8000.