Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..616s&link_type=abstract
Nature, vol. 287, Oct. 16, 1980, p. 616, 617. Research supported by the Smithsonian Institution
Physics
174
Convective Heat Transfer, Luminous Intensity, Magnetic Flux, Periodic Variations, Solar Activity, Solar Magnetic Field, Stellar Luminosity, Radiative Heat Transfer, Solar Temperature, Stellar Models, Temperature Gradients, Toroidal Plasmas
Scientific paper
The relation between solar magnetic activity and variations in luminosity over the 11-year sunspot cycle is discussed. Consideration is given to a model in which the toroidal magnetic field is concentrated into a boundary layer at the base of the convective zone, and it is shown that the adiabatic temperature gradient is directly affected by magnetic fields. Examination of the magnetic layer formed between the radiative and convective zones by means of flux expulsion allows an estimation to be made of the changes in adiabatic temperature gradient resulting from the reversal of the toroidal field at sunspot minimum and the subsequent growth of magnetic flux with the approach of sunspot maximum. Such temperature variations are calculated to result in solar luminosity variations on the order of 0.1% over the sunspot cycle, with decreases in the intervals preceding sunspot maxima.
Spiegel Edward A.
Weiss Nigel O.
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