Study on the energetic particle generation conditions in solar flares

Conditions for energetic particle generation: electrons (E > 0.025 MeV), protons and more heavier nuclei (E > 0.30 MeV/nucleus) in solar flares are considered on the basis of measurements carried out with the help of ''Prognoz'' and ''Venera'' AIS. Good correlation between amplitudes of flare electron fluxes and thermal X-ray radiation is found. Existence of two types of events in Solar cosmic rays: ones which are accompanied by hard X radiation flares and others which are not accompanied by that radiation is established. The model serving for explanation of the above phenomenon, is discussed