Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..797s&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 6, Dec. 1977, p. 797-804.
Astronomy and Astrophysics
Astrophysics
35
Solar Activity, Solar Cycles, Solar Magnetic Field, Solar Rotation, Angular Velocity, Convective Flow, Dynamo Theory, Photosphere, Solar Prominences, Sunspots
Scientific paper
Solar-cycle variations in the rotation rate of solar magnetic fields have been studied by autocorrelation analysis of photospheric magnetic fields. The observed angular velocity and its latitudinal shear show large fluctuations correlated in latitude-time space with the pattern of solar activity. The regions of large latitudinal shear and low angular velocity drift towards the equator in much the same way as sunspot and prominence zones. These results as well as earlier observations of coexisting rotation laws on the sun can be given a consistent explanation by assuming that the surface rotation rate of a magnetic tracer represents mainly the rotation rate of the deepest layers in the convection zone, to which the field line from the surface penetrates. The depths where the surface fields are rooted vary with the solar cycle.
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