Multiple far-supercritical solutions for an α{LAMBDA}-dynamo.
Abstract
We compute numerical solutions for axisymmetric, dynamically consistent mean-field dynamos in a spherical shell of conducting incompressible fluid. In the process of investigating the stability properties of solutions in the far-supercritical regime we found an unusual behaviour, with the magnetic energy decreasing discontinuously as the dynamo number is increased. A new stable solution with a more complicated field geometry emerges. In addition, a stable mixed parity state occurs at the discontinuity of the magnetic energy, between the two branches of stable pure parity solutions. For a given dynamo number there may be as many as four metastable solutions.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1995
- Bibcode:
- 1995A&A...296..700M
- Keywords:
-
- STARS: MAGNETISM;
- MAGNETIC FIELDS;
- MHD;
- DYNAMOS