Helioseismology, solar models and neutrino fluxes

We present our results concerning a systematical analysis of helioseismic implications on solar structure and neutrino production. We find Yph = 0.238 - 0.259, Rb/R⊙ = 0.708 - 0.714 and ρb = (0.185 - 0.199) gr/cm3. In the interval 0.2 < R/R⊙ < 0.65, the quantity U = P/ρ is determined with and accuracy of ±5‰ or better. At the solar center still one has remarkable accuracy, ΔU/U < 4%. We compare the predictions of recent solar models (standard and non-standard) with the helioseismic results. By constructing helioseismically constrained solar models, the central solar temperature is found to be T = 1.58 × 107K with a conservatively estimated accuracy of 1.4%, so that the major unceratainty on neutrino fluxes is due to nuclear cross section and not to solar inputs.