Resonant spin flavor precession constraints on neutrino parameters and solar magnetic fields from solar neutrino data

The resonant spin flavor precession (RSFP) constraints on neutrino parameters have been updated in light of the latest solar neutrino data. The standard solar model, in spite of its enormous success in predicting the thermal and nuclear evolution of the Sun, is unable to throw. enough light on solar magnetic activity. In the absence of a reliable theory of the solar dynamo believed to be responsible for solar magnetic activity and insufficient astrophysical data on solar magnetic activity, it may be worthwhile to constrain the solar magnetic fields from the solar neutrino observations assuming the RSFP to be responsible for the solar neutrino deficit and the possible time variation of solar neutrino flux. The configuration of the solar magnetic field consistent with the solar neutrino observations has been derived and found to be in reasonably good agreement with the distribution proposed by Akhmedov and Bychuk [Sol. Phys. JETP 68, 250 (1989)]. However, this work ruled out the magnetic field distribution in the radiation zone used by Pulido [Phys. Rep. 211. 181 (1992)]. The magnitude of the magnetic field in the radiation and the convective zone of the Sun are very sensitive to the value chosen for the neutrino magnetic moment. [S0556-2821(99)02204-3].