
We reanalyse the resonant spinflavour (RSF) solutions to the solar neutrino problem in the framework of analytic solutions to the solar magnetohydrodynamics (MHD) equations. By substantially eliminating the arbitrariness associated to the magnetic field profile due to both mathematical consistency and physical requirements we propose the simplest scheme (MHDRSF, for short) for solar neutrino conversion using realistic static MHD solutions. Using such effective twoparameter scheme we perform the first global fit of the recent solar neutrino data, including event rates as well as zenith angle distributions and recoil electron spectra induced by solar neutrino interactions in SuperKamiokande. We compare quantitatively our simplest MHDRSF fit with vacuum oscillation (VAC) and MSWtype (SMA, LMA and LOW) solutions to the solar neutrino problem using a common wellcalibrated theoretical calculation and fit procedure. We find our MHDRSF fit to be somewhat better than those obtained for the favored neutrino oscillation solutions, though not in a statistically significant way with Deltam(2) approximate to 10(8) eV(2) and sin(2) 2 theta = 0. We briefly discuss the prospects to disentangle our MHDRSF scenario from oscillationtype solutions to the solar neutrino problem at future solar neutrino experiments, giving some predictions for the SNO experiment.
