  The objective of this article is to use Fourier-Hankel decomposition as
suggested earlier by Braun & Fan (1998) to estimate the integrated horizontal
meridional flow velocity as a function of mode penetration depth, and to find
ways of potentially improve this technique. We use a time series of 43200 (30
days) consecutive full-disk Dopplergrams obtained by the MDI (Michelson Doppler
Imager) instrument aboard the SOHO (Solar Heliospheric Observatory) spacecraft
in April 1999. We find averaged meridional flow estimates of 15 m/s for modes
with a penetration depth in the upper 20 Mm of the solar convection zone. This
reproduces the results of the earlier investigations. Moreover we conclude that
this method has the potential to become a new technique to measure the
meridional circulation in the deep convection zone, if some improvements will
be applied.
