  We discuss that energetic electrons are generated near the X-type magnetic
reconnection region due to a surfing acceleration mechanism. In a thin plasma
sheet, the polarization electric fields pointing towards the neutral sheet are
induced around the boundary between the lobe and plasma sheet in association
with the Hall electric current. By using a particle-in-cell simulation, we
demonstrate that the polarization electric fields are strongly enhanced in an
externally driven reconnection system, and some electrons can be trapped by the
electrostatic potential well of the polarization field. During the trapping
phase, the electrons can gain their energies from the convection/inductive
reconnection electric fields. We discuss that relativistic electrons with MeV
energies are quickly generated in and around the X-type neutral region by
utilizing the surfing acceleration.
