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We discuss the impact of the recent KamLAND constraint on the solaranti-neutrino flux on the analysis of solar neutrino data in the presence ofMajorana neutrino transition magnetic moments and solar magnetic fields. Weconsider different stationary solar magnetic field models, both regular andrandom, highlighting the strong enhancement in the anti-neutrino productionrates that characterize turbulent solar magnetic field models. Moreover, weshow that for such magnetic fields inside the Sun, one can constrain theintrinsic neutrino magnetic moment down to the level of mu_nu lessthan fewtimes 10^-12 x mu_B irrespective of details of the underlying turbulence model.This limit is more stringent than all current experimental sensitivities, andsimilar to the most stringent bounds obtained from stellar cooling. We alsocomment on the robustness of this limit and show that at most it might beweakened by one order of magnitude, under very unlikely circumstances.Comment: 25 pages, 5 figures; final version to appear in Phys. Rev.

Enhanced solar antineutrino flux in random magnetic fields