  Assisted with Magnetospheric Multiscale (MMS) mission capturing unprecedented
high-resolution data in the terrestrial magnetotail, we apply a local
streamline-topology classification methodology to investigate the
categorization of the magnetic-field topological structures at kinetic scales
in the turbulent reconnection outflow. It is found that strong correlations
between the straining and rotational part of the velocity gradient tensor as
well as the magnetic-field gradient tensor. The strong energy dissipation
prefers to occur at regions with high magnetic stress or current density, which
is contributed mainly by O-type topologies. These results indicate that the
kinetic structures with O-type topology play more import role in energy
dissipation in turbulent reconnection outflow.
