Zonally Averaged Meridional Flows Determined by Ring Analysis of
Untracked Data

Richard S. Bogart
Stanford University, CSSA - HEPL A202
Stanford, Calif. 94305-4085, U.S.A.

Sarbani Basu
Astronomy Department, Yale University, P. O. Box 208101, 
New Haven Conn. 06520-8101, U. S. A.


Measurements of near-surface meridional flow profiles can be obtained
from ring-diagram analysis.  Ring-diagram analysis ordinarily relies
on tracking of the targeted regions of study in order to distinguish
the physical targets spatially and to remove the large contribution
of solar rotational velocity to the frequency splittings.  This, together
with the effects of geometrical foreshortening, limits the time period
for any one analysis to a few days.  It also has the potential for
introducing systematic biases as the aspect of each tracked region
changes during its disc passage.  In determining the zonally averaged
meridional flow field, however, we can overcome these problems by
analyzing untracked latitude zones for periods up to or even exceeding
a full solar rotation.  We present results obtained from several full
rotations of MDI Doppler data during selected Dynamics Campaigns of nearly
continuous coverage.  We also compare these results with those obtained by
averaging the results of traditional tracked analyses.