Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0501s&link_type=abstract
American Astronomical Society, SPD meeting #42, #5.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The talk will present a personal view of our current understanding of the solar cycle. Central points are the role of magnetic buoyancy as the main driving force (together with differential rotation), and the absence of an essential role for the radial shear in the tachocline. The resulting view is essentially that of Babcock and Leighton of half a century ago, but now supported by much more observational and theoretical evidence. I will show how the traditional interpretation of the cycle as a dynamo driven by convective turbulence is (and has always been) incompatible with the observations, as well as with the numerical results that have accumulated over the past decade. Instead, I will argue that to make progress it will pay off i) to directly confront a couple of currently somewhat neglected theoretical problems, and ii) to address some well-known observational puzzles that have not yet found convincing interpretations in theories of the cycle but may well hold critical clues.
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