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Doppler shifts of the Fe I spectral line at lambda5250 Angstroms from thefull solar disk obtained over the period 1986 to 2009 are analyzed to determinethe circulation velocity of the solar surface along meridional planes.Simultaneous measurements of the Zeeman splitting of this line are used toobtain measurements of the solar magnetic field that are used to select lowfield points and impose corrections for the magnetically induced Doppler shift.The data utilized is from a new reduction that preserves the full spatialresolution of the original observations so that the circulation flow can befollowed to latitudes of 80 degrees N/S. The deduced meridional flow is shownto differ from the circulation velocities derived from magnetic patternmovements. A reversed circulation pattern is seen in polar regions for threesuccessive solar minima. An surge in circulation velocity at low latitudes isseen during the rising phases of cycles 22 and 23.

astrophysical journal/the astrophysical journal

Solar Meridional Circulation from Doppler Shifts of the Fe I line at  lambda 5250 Angstroms as Measured by the 150-foot Solar Tower Telescope at  the Mt. Wilson Observatory