Hα surges in emerging flux regions as an evidence of magnetic field reconnection Original Research Article

The morphological and dynamical characteristics of a typical EFR-surge, which was observed with a high resolution Hα filtergraph are examined in details. Two kinds of downward-moving features were found in the Hα surge region: One is along the same magnetic field line as that of the upward-moving feature. The other streams along a different magnetic field line where no upward-moving feature was found. It is shown that these two kinds of downward-moving features along the different magnetic field lines are well explained by a magnetic field reconnection between emerging magnetic loops and pre-existing coronal magnetic field.