  We study the effect of random magnetic fields in the spin-flavor precession
of solar neutrinos in a three generation context, when a non-vanishing
transition magnetic moment is assumed. While this kind of precession is
strongly constrained when the magnetic moment involves the first family, such
constraints do not apply if we suppose a transition magnetic moment between the
second and third families. In this scenario we can have a large non-electron
anti-neutrino flux arriving on Earth, which can lead to some interesting
phenomenological consequences, as, for instance, the suppression of day-night
asymmetry. We have analyzed the high energy solar neutrino data and the KamLAND
experiment to constrain the solar mixing angle, and solar mass difference, and
we have found a larger shift of allowed values.
