HR: 0830h
AN: SP11B-07    [Abstracts]
TI: Zonally Averaged Meridional Flows Determined by Ring Analysis of Untracked Data
AU: * Bogart, R S
EM: RBogart@spd.aas.org
AF: Stanford University, CSSA - HEPL A202, Stanford, Cal 94305-4085 United States
AU: Basu, S
EM: SBasu@spd.aas.org
AF: Yale University, Astronomy Department P. O. Box 208101, New Haven, Con 06520-8101 United States
AB: 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.
UR: http://rick.stanford.edu/pubs/spd05/notrack/
DE: 7522 Helioseismology
DE: 7536 Solar activity cycle (2162)
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly