Reversals of the solar dipole

Abstract

Context. During a solar magnetic field reversal the magnetic dipole moment does not vanish, but migrates between poles, in contradiction to the predictions of mean-field dynamo theory. Aims. We try to explain this as a consequence of magnetic fluctuations. Methods. We used the statistics of fluctuations to estimate observable signatures. Results. Simple statistical estimates, taken with results from mean-field dynamo theory, suggest that a non-zero dipole moment may persist through a global field reversal. Conclusions. Fluctuations in the solar magnetic field may play a key role in explaining reversals of the solar dipole. © ESO, 2013.