The Solar Dynamo NSO Solar Physics Summer School Tamara Rogers, HAO June 15, 2007

Mar 06, 2012

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Regions of strong magnetic field (3000 Gauss)About 20000km diameterLifetime of a few weeks. PSPT (blue). PSPT (CaK). Sunspots on Solar Disk. Yohkoh X-ray images. X-ray Activity over sunspot cycle. . . . . . . . . Joy's law. . . Butterfly diagramEquatorward propagation of activity starting from 35 degrees latitude over 11 years (individual lifetimes of sunspots ~ a few weeks)Hale's polarity lawOpposite polarity of bipolar groups in north and south hemispherePolarity in individual hemispher32834

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The Solar Dynamo NSO Solar Physics Summer School Tamara Rogers, HAO June 15, 2007

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2. Precision solar photospheric telescopePrecision solar photospheric telescope

10. Summary of Observations

20. Solutions of the dynamo equations allow wave solutions (Parker 1955) who suggested that a latitudinally propagating wave was the source of the sunspot cycle Dynamo waves travel in the direction (Parker-Yoshimura sign rule):

25. The Flux Transport Dynamo