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The powerful flares that occurred in the Sun on September 4-10, 2017 areanalyzed on the basis of the technique for the quantitative diagnostics ofproton flares developed in IZMIRAN in 1970-1980s. It is shown that the fluxesand energy spectra of protons with energy of tens of MeV coming to Earthqualitatively and quantitatively correspond to the intensity and frequencyspectra of microwave radio bursts in the range 2.7-15.4 GHz. In particular, theflare of 4 Sept. with a peak radio flux S ~ 2000 sfu at the frequency f ~ 3 GHz(i.e., with a soft radio spectrum) was accompanied by a significant proton fluxJ (> 10 MeV) ~ 100 pfu and soft energy spectrum with the exponent gamma ~ 3.0,and the powerful flare of 10 Sept. with S ~ 21000 sfu at f ~ 15 GHz (i.e., witha hard radio spectrum) led to a very intense proton event with J (> 10 MeV) ~1000 pfu with a hard energy spectrum (gamma ~ 1.4), including a ground levelenhancement (GLE72). This is further evidence that data on microwave radiobursts can be successfully used to diagnose proton flares, regardless of theparticular source of acceleration of particles on the Sun.

Diagnostic Analysis of the Solar Proton Flares of September 2017 by Their Radio Bursts