PHENOMENA RELATED TO ELECTRON-BEAMS IN SOLAR-FLARES

Starting from basic observational characteristics of solar flares the flare physical processes are briefly described. The role of electron b eams in such a flare scenario is expressed. The observational manifest ations of electron beams as, e.g., type III and U radio bursts are pre sented. Then results of numerical modelling of these processes are sho wn. Besides the magnetic field-line reconnection process which is cons idered to be a primary flare one, the main attention is devoted to the evolution of electron beams in flare loops, to the interpretation of U bursts, to the electron beam bombardment of deep and dense layers of the solar atmosphere and to accompanied processes as the evaporation process and the asymmetry of optical chromospheric lines.