ИСТИНА

We present the results on the analysis of microwave emission in solar flares related to strong solar energetic particle (SEP) events observed during the previous solar cycle. The target of the work is to find criteria based on the solar flare features that would allow us to separate the SEP events into groups with more homogeneous physical/topological properties. In the current study, we compared peak frequency of microwave spectra and spectral index with spectral characteristics of SEP proton fluxes. The two groups of events related to the value of the peak frequency are found. We discuss revealed tendencies and physical reasons of the two population appearances.