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Contributed talk: Observational constraints on the Sun’s global dynamo

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DY2W03 - Modeling, observing and understanding flows and magnetic fields in the Earth's core and in the Sun

I will present observations of the axisymmetric toroidal and poloidal magnetic fields observed at the solar surface. The toroidal component is due to flux emergence, and indicates that approximately 10^23 Mx of toroidal flux is lost from each hemisphere during the course of a solar cycle. A similar amount is generated through the winding up of the polar fields. Stokes Theorem tells us that the polar fields themselves are the accumulation of magnetic flux which crosses the equator in the photosphere, where we now have 40 years of detailed observations. These observations allow us to constrain both solar cycle variability and indicate the importance of Joy’s law.

This talk is part of the Isaac Newton Institute Seminar Series series.

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