  Large scale flows in the Sun play an important role in the dynamo process
linked to the solar cycle. The important large scale flows are the differential
rotation and the meridional circulation with an amplitude of km/s and few m/s ,
respectively. These flows also have a cycle related components, namely the
torsional oscillations. Our attempt is to determine large-scale plasma flows on
the solar surface by deriving horizontal flow velocities using the techniques
of solar granule tracking, dopplergrams, and time distance helioseismology.
Coherent structure tracking (CST) and time distance helioseismology were used
to investigate the solar differential rotation and meridional circulation at
the solar surface on a 30 day HMI SDO sequence. The influence of a large
sunspot on these large scale flows with a specific 7 day HMI SDO sequence has
been also studied. The large scale flows measured by the CST on the solar
surface and the same flow determined from the same data with the
helioseismology in the first 1 Mm below the surface are in good agreement in
amplitude and direction. The torsional waves are also located at the same
latitudes with amplitude of the same order. We are able to measure the
meridional circulation correctly using the CST method with only three days of
data and after averaging between + and -15 degrees in longitude. We conclude
that the combination of CST and Doppler velocities allows us to detect properly
the differential solar rotation and also smaller amplitude flows such as the
meridional circulation and torsional waves. The results of our methods are in
good agreement with helioseismic measurements.
