A NEW COMPONENT OF SOLAR DYNAMICS: NORTH-SOUTH DIVERGING FLOWS MIGRATING TOWARD THE EQUATOR WITH AN 11 YEAR PERIOD

摘要

Time-distance helioseismology analysis of Dopplergrams provides maps of torsional oscillations and meridional flows. Meridional flow maps show a time-varying component that has a banded structure that matches the torsional oscillations with an equatorward migration over the solar cycle. The time-varying component of meridional flow consists of a flow diverging from the dominant latitude of magnetic activity. These maps are compared with other torsional oscillation maps and with magnetic flux maps, showing a strong correlation with active latitudes. These results demonstrate a strong link between the time-varying component of the meridional flow and the torsional oscillations.