  Effects of CP-violating phases in active-sterile solar neutrino oscillations
are discussed in a general scheme of 3+N_{s} mixing, without any constraint on
the mixing between the three active and the N_{s} sterile neutrinos, assuming
only a realistic hierarchy of neutrino mass-squared differences. A generalized
Parke formula describing the neutrino oscillation probabilities inside the Sun
is calculated. The validity of the analytical calculation and the probability
variation due to the unknown CP-violating phases are illustrated with a
numerical calculation of the evolution equation in the case of 3+1 neutrino
mixing.
