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Do young Suns undergo magnetic reversals?

Published online by Cambridge University Press:  26 February 2010

Stephen C. Marsden ,
Sandra V. Jeffers ,
Jean-Francois Donati ,
Matthew W. Mengel ,
Ian A. Waite  and
Brad D. Carter
Stephen C. Marsden
Affiliation:
Anglo-Australian Observatory, P.O. Box 296, Epping, NSW 1710, Australia email: [email protected]
Sandra V. Jeffers
Affiliation:
Sterrekundig Instituut, Universiteit Utrecht, P.O. Box 80000, NL-3508 TA Utrecht, The Netherlands email: [email protected]
Jean-Francois Donati
Affiliation:
Laboratoire d'Astrophysique de Toulouse-Tarbes, Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, F-31400 Toulouse, France email: [email protected]
Matthew W. Mengel
Affiliation:
Faculty of Sciences, University of Southern Queensland, Toowoomba 4350, Australia email: [email protected], [email protected], [email protected]
Ian A. Waite
Affiliation:
Faculty of Sciences, University of Southern Queensland, Toowoomba 4350, Australia email: [email protected], [email protected], [email protected]
Brad D. Carter
Affiliation:
Faculty of Sciences, University of Southern Queensland, Toowoomba 4350, Australia email: [email protected], [email protected], [email protected]
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Abstract

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A key part of the modern-day regenerative solar magnetic dynamo is the reversal of the Sun's global magnetic field every eleven years. However, recent theoretical models indicate that young-rapidly rotating Sun-like stars may not always undergo full magnetic reversals, but instead may sometimes undergo “attempted” reversals where the magnetic field declines in strength only to return with the same polarity. Using the technique of Zeeman Doppler imaging we have mapped the magnetic field topology of a small sample of young Sun-like stars at multiple epochs, and present tentative evidence of an “attempted” magnetic field reversal on one of our stars.

Keywords

stars: late-typestars: imagingstars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 130 - 135
Copyright
Copyright © International Astronomical Union 2010

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