HAO Colloqium - Robert Cameron, Max Planck Inst. for Solar System Research

The solar dynamo: Inferences from observationsObserved butterfly maps of the Sun’s surface toroidal and poloidal fields cover the last four cycles. The surface toroidal field is the result of flux emergence with a systematic preference for E-W alignment according to Hale's law. During activity maxima, the yearly averaged toroidal field is observed to be unipolar in each hemisphere, with a polarity which reverses from cycle to cycle. The application of Stokes theorem to the induction equation then shows the roll of the surface radial magnetic field in producing a net toroidal flux in each hemisphere. Stokes theorem can also be applied to the radial flux at the solar surface in each hemisphere in order to investigate solar variability. The observed variability of the Sun on timescales from years to 10,000 years will be discussed in the context of the observations.


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Wednesday, May 16, 2018 - 2:00am to 3:00am

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