Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..149..231l&link_type=abstract
Solar Physics, vol. 149, no. 2, p. 231-241
Astronomy and Astrophysics
Astronomy
26
Correlation, Drift Rate, Plasma Drift, Solar Atmosphere, Solar Convection (Astronomy), Solar Cycles, Solar Magnetic Field, Solar Wind, Solar Rotation, Synoptic Measurement
Scientific paper
A method of two-dimensional correlation functions has been applied to a sequence of synoptic maps of the large-scale magnetic field to obtain the meridional drift pattern of field structures. The meridional drift profile obtained is antisymmetric about the equator. The meridional drift is directed from the equator to the poles at latitudes below 45 deg. A maximum drift velocity of 11-13 m/sec is attained in the latitude range 30 deg. A picture of the space-time distribution of meridional drift is also obtained, which may be interpreted as resulting from the effect of azimuthal convective rolls (3 rolls per hemisphere) on the large-scale magnetic field. Rolls originate at high latitudes following the cycle maximum, and migrate equatorwards until the minimum of the next cycle. The picture in the equatorial region can correspond to convective rolls with lifetimes of about two years, or to the process of interaction of rolls from two hemispheres.
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