  Time-frequency analysis of data from the GALLEX and GNO solar neutrino
experiments shows that some features in power-spectrum analyses of those
datasets are due to aliasing. We normalize data for each of the four
experiments in the GALLEX series, concatenate the resulting normalized data,
and then form time-frequency displays. We also form time-frequency displays of
the two principal modulations found in the data, at 11.87 yr-1 and at 13.63
yr-1, and of the datasets formed by subtracting these modulations from the
actual (normalized) data. The results suggest that the true modulation is that
at 11.87 yr-1, consistent with the results of our earlier analysis of Homestake
solar neutrino data. Comparison with helioseismology data indicates that
modulation is occurring either in the radiative zone just below the tachocline,
presumably by the RSFP (resonant spin-flavor precession) process, or in the
core, presumably due to inhomogeneities and fluctuations in the nuclear-burning
process.
