  Detailed knowledge of surface dynamics is one of the key points in
understanding magnetic solar activity. The motions of the solar surface, to
which we have direct access via the observations, tell us about the interaction
between the emerging magnetic field and the turbulent fields.
  The flows computed with the coherent structure tracking (CST) technique on
the whole surface of the Sun allow for the texture of the velocity modulus to
be analyzed and for one to locate the largest horizontal flows and determine
their organization. The velocity modulus maps show structures more or less
circular and closedwhich are visible at all latitudes; here they are referred
to as donuts. They reflect the most active convective cells associated with
supergranulation. These annular flows are not necessarily joined as would seem
to indicate the divergence maps. The donuts have identical properties
(amplitude, shape, inclination, etc.) regardless of their position on the Sun.
The kinematic simulation of the donuts' outflow applied to passive scalar
(corks) indicates the preponderant action of the selected donuts which are,
from our analysis, one of the major actors for the magnetic field diffusion on
the quiet Sun. The absence of donuts in the magnetized areas (plages) indicates
the action of the magnetic field on the strongest supergranular flows and thus
modifies the diffusion of the magnetic field in that location. The detection of
the donuts is a way to locate in the quiet Sun the vortex and the link with the
jet, blinkers, coronal bright points (campfires), or other physical structures.
Likewise, the study of the influence of donuts on the evolution of active
events, such as the destruction of sunspots, filament eruptions, and their
influences on upper layers via spicules and jets, could be done more
efficiently via the detection of that structures.
