ИСТИНА

To the present time, there is no single answer to a very important question: does the acceleration of charged particles observed during the events of solar energetic particles (SEP), occur during solar flares or shock waves generated by coronal mass ejections (CME), or both mechanism contribute to the acceleration in different degrees. In the frames of Russian-Bulgarian project “The origin of solar energetic particles: solar flares vs. coronal mass ejections” it is proposed to consider this problem using statistical analysis of observational data on SEP events and related phenomena and to draw a conclusion about the numerical ratio of the contribution of flares and CMEs to the duration and geoeffectiveness of SEP events. As an experimental data on the hard X-ray and gamma radiation of solar flares, information from the CORONAS-F space observatory operating in the near- Earth orbit from 2001 to 2005 can be used. The scintillation spectrometers SONG (gamma radiation in the energy range 0.03-200 MeV) and SPR-N (hard X-ray radiation in the energy range 15-100 keV) installed onboard the CORONAS-F, detected more than a hundred solar flares. The analysis of the flares, the most interesting for the project, including the events of August 2002, October-November 2003 and January 2005, is presented in this paper.