# University of Minnesota

Aerospace Engineering and Mechanics

**Spring 2003 Seminar Series**

*Generation of helicity and Reynolds stress by magnetostrophic
turbulence*

*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.