Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..178s&link_type=abstract
Astronomische Nachrichten, vol. 323, no. 3/4, p. 178-185
Other
6
Solar Cycle, Sunspots
Scientific paper
There are two kinds of questions that must be asked in the context of sunspots: those concerning the 22-year magnetic cycle, and those concerning individual spots. The magnetic cycle is probably the result of an alpha Omega dynamo, but the nature and the magnitude of the alpha coefficient is not clear. The shear layer at the base of the convection zone plays an essential role in dynamo models, but it is not clear whether there is sufficient shearing for an alpha Omega dynamo. Further, several mechanisms have been proposed that yield a butterfly diagram, and at least two ways are possible for the generation of long-term variation. Sunspots show an enigmatic variation of darkness during the cycle. Other questions concerning individual spots are: Are current sheets essential? Where in the spot do convective or fluting instabilities develop? How intense is the convective energy transport in the umbra? What is the best description of sunspot decay - diffusion over the whole spot, or erosion at the boundary? And why is the variation of the frequency of sunspots in phase with the global cyclic variation of the solar luminosity?
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