Detecting Solar Neutrino Flares and Flavors

Intense solar flares originated in sun spots produce high energy particles(protons, $\alpha$) well observable by satellites and ground-based detectors.The flare onset produces signals in different energy bands (radio, X, gamma andneutrons). The most powerful solar flares as the ones occurred on 23 February1956, 29 September 1989 and the more recent on October 28th, and the 2nd, 4th,13th of November 2003 released in sharp times the largest flare energies(${E}_{FL} \simeq {10}^{31}\div {10}^{32} erg). The high energy solar flareprotons scatter within the solar corona and they must be source of a promptneutrino burst through the production of charged pions. Later on, solar flareparticles hitting the atmosphere may marginally increase the atmosphericneutrino flux. The prompt solar neutrino flare may be detected in the largestunderground $\nu$ detectors. Our estimate for the October - November 2003 solarflares gives a number of events above the unity. The electron/muon $\nu$signals and spectra may reflect the neutrino flavour mixing. A surprising tauappearance may occur for a hard {E}_nu_mu}} \to {E}_{{\nu}_{\tau}}\simeq> 4GeV$) flare spectra.Comment: 13 pages, 4 figures ; minor editorial correction