Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...432..249m&link_type=abstract
Astronomy and Astrophysics, Volume 432, Issue 1, March II 2005, pp.249-259
Astronomy and Astrophysics
Astrophysics
14
Magnetic Fields, Magnetohydrodynamics, Stars: Activity, Stars: Late-Type, Stars: Rotation, Stars: Magnetic Fields
Scientific paper
Recently the discovery of the “flip-flop” phenomenon, by which a predominant “active” longitude jumps by about 180 °, on several rapidly rotating late-type stars has directed attention to the issues surrounding the presence of large-scale nonaxisymmetric magnetic fields in these objects. Here we study nonlinear mean field dynamo models with quasi-cylindrical rotation laws, acting in spherical shells. Stable nonaxisymmetric magnetic fields are found to be generated for a range of parameters and, for certain of these models, jumps in a measure plausibly related to the position of active longitudes are found to occur. In general, nonaxisymmetric fields appear to be easier to generate in thinner dynamo-active regions. However, flip-flops appear to be stronger for intermediate thicknesses of the dynamo-active shells.
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