HIGH-ENERGY PARTICLES IN SOLAR-FLARES

Accelerated particles appear to coexist inseparably with most forms of energy release in solar flares and coronal mass ejections. We identif y at least five different populations of high-energy electrons and ion s. High-energy particles, accelerated efficiently in the flare in grea t numbers, transport a large fraction of the flare energy to other sit es. This behavior makes them an integral part of the flare process. Mu ch new data has come from two spacecraft launched in 1991: the Compton Gamma-Ray Observatory and Yohkoh. This review concentrates on particl es in flares, mainly using X-ray and gamma-ray data rather than measur ements of ''escaping'' particles observed in interplanetary space.