Differential Rotation and Magnetism across the HR Diagram

Reversals of the solar dipole

Not scheduled

1m

132:028 (Nordita)

Talk

Speaker

Dmitry Sokoloff (Moscow State University)

Description

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. We try to explain this as a consequence of magnetic fluctuations. We used the statistics of fluctuations to estimate observable signatures. 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. Fluctuations in the solar magnetic field may play a key role in explaining reversals of the solar dipole. --------------------------------------------------------------------------------