| Issue |
A&A
Volume 395, Number 3, December I 2002
|
|
|---|---|---|
| Page(s) | 1013 - 1022 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20021320 | |
| Published online | 18 November 2002 | |
Deep minima in stellar dynamos
1
SVE Group, Manchester Computing, University of Manchester, Manchester M13 9PL, UK
2
Department of Mathematics, University of Manchester, Manchester M13 9PL, UK
Corresponding author: J. Brooke, j.m.brooke@mcc.ac.uk
Received:
9
July
2002
Accepted:
10
September
2002
We study a Cartesian analogy for a solar dynamo model to investigate systematically a dynamo model limited by the back reaction of the Lorentz force on the differential rotation. In particular, we investigate intermittent behaviour found at low turbulent magnetic Prandtl numbers τ, and determine empirical scaling laws with τ. We find this class of models to be incapable of producing extended periods of “normal” behaviour separated by occasional “grand minima” – rather the behaviour is a mirror image, with occasional “grand maxima”. Further we find the existence of solar-like torsional oscillations to be incompatible with low magnetic Prandtl number intermittent regimes.
Key words: magnetic fields / magnetohydrodynamics (MHD) / Sun: magnetic fields
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.