A STUDY OF SURGES AND FLARES WITHIN AN ACTIVE REGION

Active region 2684 was observed by the Solar Maximum Mission and groun d-based observatories simultaneously for over 12 hours on September 23 , 1980. During these observations, recurrent surges were detected abov e an area with complex parasitic magnetic polarity located at the peri phery of the active region. The time evolution of the Halpha surges, C IV brightenings and X-ray spikes leads to the conclusion that the ene rgy source is in the corona, from magnetic reconnection. The energy is transported by energetic charged particles along the loops, thereby h eating the chromosphere as the particles lose their energy. The diverg ent motion of the spots corresponding to small dipoles at the base of the surge indicates that there is important magnetic reorganisation. A ccording to the magnetic field-line configuration (large loop or open structures), X-rays can (or cannot) be associated with surges.