Can cellular convection in a rotating spherical shell maintain both global and local magnetic fields?

Getling, A.V., Simitev, R. and Busse, F.H. (2007) Can cellular convection in a rotating spherical shell maintain both global and local magnetic fields? International Journal of Geomagnetism and Aeronomy, 7, GI1004. (doi:10.1029/2005GI000138)

[img] Text
arxiv.html

4kB

Abstract

A convection-driven MHD dynamo in a rotating spherical shell, with clearly defined structural elements in the flow and magnetic field, is simulated numerically. Such dynamos can be called deterministic, in contrast to those explicitly dependent on the assumed properties of turbulence. The cases most interesting from the standpoint of studying the nature of stellar magnetism demonstrate the following features. On a global scale, the convective flows can maintain a "general" magnetic field with a sign-alternating dipolar component. Local (in many cases, bipolar) magnetic structures are associated with convection cells. Disintegrating local structures change into background fields, which drift toward the poles. From time to time, reversals of the magnetic fields in the polar regions occur, as "new" background fields expel the "old" fields.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Simitev, Dr Radostin
Authors: Getling, A.V., Simitev, R., and Busse, F.H.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:International Journal of Geomagnetism and Aeronomy
Journal Abbr.:Int. J. Geomagn. Aeron.
ISSN:1524-4423
Published Online:31 March 2007

University Staff: Request a correction | Enlighten Editors: Update this record