The solar cycle from data on the large-scale surface magnetic field and solar-dynamo theory |
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Authors: | E P Popova D D Sokoloff |
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Institution: | 1.Moscow State University,Moscow,Russia |
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Abstract: | Latitude-time (butterfly) diagrams of the large-scale solar magnetic field differ appreciably from the butterfly diagrams
for sunspots. Tilted features corresponding to waves propagating from the middle latitudes to the equator are virtually absent
from the diagrams for the large-scale magnetic field. The latitude-time diagram of the 22-year solar cycle based on data for
the large-scale surface field appears as a checkerboard pattern rather than a traveling wave. Solutions describing similar
behavior for the poloidal magnetic field are found for Parker’s solar-dynamo equations. These solutions agree with observations
especially well if meridional circulation is added to the two sources generating the magnetic-field in this dynamo-differential
rotation and mirror-asymmetric convection. |
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