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Radio blazars have been linked both to individual high-energy neutrino eventsand to excesses in likelihood sky maps constructed from lower-energy neutrinodata. However, the exact mechanism by which neutrinos are produced in thesesources is still unknown. Here, we demonstrate that IceCube neutrinos withenergies over 200 TeV, which were previously associated with bright radioblazars, are significantly more likely to be accompanied by flares oflower-energy events, compared to those lacking blazar counterparts. Theparsec-scale core radio flux density of blazars, positioned within the errorregions of energetic events, is strongly correlated with the likelihood of aday-scale lower-energy neutrino flare in directional and temporal coincidencewith the high-energy event, reported by IceCube. The probability of a chancecorrelation is $3.6*10^{-4}$. This confirms the neutrino-blazar connection in anew and independent way, and provides valuable clues to understanding theorigin of astrophysical neutrinos.

Neutrino flares of radio blazars observed from TeV to PeV