A search has been made for a correlation between large solar flares and neutrino events observed in Kamiokande for the period of July 1983–July 1988. No significant neutrino signal was found at the time of a solar flare, giving a limit on the time-integrated ‘‘solar-flare’’ ${\nu }_e$ flux <3.7×${10}^7$ (2.5×${10}^9$) /${\mathrm{cm}}^{\mathrm{-}2}$ per flare at 90% confidence level, for $E_{\nu }$=100 (50) MeV. These limits are 2000 (60) times smaller than the value required for neutrinos with those energies to account for the excess of signal in the ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}$ solar-neutrino experiment of some of the corresponding solar-flare times.

• Received 12 September 1988

DOI:https://doi.org/10.1103/PhysRevLett.61.2653