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Global-scale wreath-building dynamos in stellar convection zones

Published online by Cambridge University Press:  12 August 2011

Benjamin P. Brown ,
Matthew K. Browning ,
Allan Sacha Brun ,
Mark S. Miesch  and
Juri Toomre
Benjamin P. Brown
Affiliation:
Dept. Astronomy, University of Wisconsin, Madison, WI 53706-1582 email: [email protected] Center for Magnetic Self Organization in Laboratory and Astrophysical Plasmas, University of Wisconsin, Madison, WI 537066-1582
Matthew K. Browning
Affiliation:
Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON M5S3H8Canada
Allan Sacha Brun
Affiliation:
DSM/IRFU/SAp, CEA-Saclay and UMR AIM, CEA-CNRS-Université Paris 7, 91191 Gif-sur-Yvette, France
Mark S. Miesch
Affiliation:
High Altitude Observatory, NCAR, Boulder, CO 80307-3000
Juri Toomre
Affiliation:
JILA and Dept. Astrophysical & Planetary Sciences, University of Colorado, Boulder, CO 80309-0440
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Abstract

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When stars like our Sun are young they rotate rapidly and are very magnetically active. We explore dynamo action in rapidly rotating suns with the 3-D MHD anelastic spherical harmonic (ASH) code. The magnetic fields built in these dynamos are organized on global-scales into wreath-like structures that span the convection zone. Wreath-building dynamos can undergo quasi-cyclic reversals of polarity and such behavior is common in the parameter space we have been able to explore. These dynamos do not appear to require tachoclines to achieve their spatial or temporal organization. Wreath-building dynamos are present to some degree at all rotation rates, but are most evident in the more rapidly rotating simulations.

Keywords

convectionMHDstars: interiorsstars: magnetic fieldsstars: rotation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 78 - 85
Copyright
Copyright © International Astronomical Union 2011

References

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