  We further study the relations between parameters of bursts at 35 GHz
recorded with the Nobeyama Radio Polarimeters during 25 years, on the one hand,
and solar proton events, on the other hand (Grechnev et al. in Publ. Astron.
Soc. Japan 65, S4, 2013a). Here we address the relations between the microwave
fluences at 35 GHz and near-Earth proton fluences above 100 MeV in order to
find information on their sources and evaluate their diagnostic potential. A
correlation was found to be pronouncedly higher between the microwave and
proton fluences than between their peak fluxes. This fact probably reflects a
dependence of the total number of protons on the duration of the acceleration
process. In events with strong flares, the correlation coefficients of
high-energy proton fluences with microwave and soft X-ray fluences are higher
than those with the speeds of coronal mass ejections. The results indicate a
statistically larger contribution of flare processes to high-energy proton
fluxes. Acceleration by shock waves seems to be less important at high energies
in events associated with strong flares, although its contribution is probable
and possibly prevails in weaker events. The probability of a detectable proton
enhancement was found to directly depend on the peak flux, duration, and
fluence of the 35 GHz burst, while the role of the Big Flare Syndrome might be
overestimated previously. Empirical diagnostic relations are proposed.
