Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..112...17d&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 112, no. 1, 1987, p. 17-35. Navy-supported research.
Physics
16
Magnetic Field Configurations, Magnetic Flux, Photosphere, Solar Granulation, Solar Magnetic Field, Solar Rotation, Atmospheric Circulation, Meridional Flow, Spatial Distribution, Stellar Models
Scientific paper
The author studies the time-asymptotic behavior of the large-scale photospheric magnetic field by solving analytically for the eigenstates of the transport equation. The nonaxisymmetric eigenstates are barberpole patterns of flux, localized near either the solar equator or the poles, where the rotational shear vanishes. They rotate rigidly at approximately the equatorial or polar rate, respectively, and decay on the geometric mean of the short time-scale for shearing by differential rotation and the long time-scale for dispersal by supergranular diffusion. The author also investigates the effects of meridional convection on the evolution of the field, by including a hypothetical poleward flow in the transport equation. Such a flow contributes to the decay of the nonaxisymmetric patterns on its own, intermediate time-scale, and also hastens the relaxation of the axisymmetric field to a modified dipolar configuration.
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