  A simple and model-independent method is proposed to extract information on
solar $\nu_e$ transition into antineutrinos via the spin flavor precession
(SFP) from the measurements of solar neutrino flux at SNO and Super-Kamiokande.
Incorporating the KamLAND experimental results, we examine how large the
suppression of the solar neutrino flux could be due to the SFP mechanism in the
context of the hybrid scenario with two-flavor neutrino and antineutrino
mixings.
