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Solar quasi-biennial oscillations with period range 0.6 to 4 years, areprominent in records of solar activity. Here we show that the 1.6 yearquasi-biennial oscillation in solar activity has the exceptional feature ofphase inversion between each solar cycle in the sequence of four solar cycles,20 to 23. The hypothesis advanced is that this feature is due to synchronicitybetween solar activity and planetary alignment. An index of alignment betweenEarth and Mercury, Venus, Jupiter and Saturn is shown to have dominant peaks ofalignment separated by 1.6 years in each solar cycle with, however, peakalignments shifting by half a period, 0.8 years, between alternate solarcycles. Accepting that solar activity increases when planets align wouldexplain the phase inversion in alternate solar cycles observed in the 1.6 yearquasi-biennial oscillation. Two new methods were developed to test thishypothesis: (a) Narrow band filtering of solar activity with the pass bandbased on the frequency content of the planetary alignment index. (b)Superposing intervals of raw solar activity data centered on times of maximumplanet alignment. Both methods provided strong support for the hypothesis.Planetary alignment is complex but predictable enabling the forecasting ofsolar oscillation intermittency and future oscillation spectral content.

Evidence that 1.6-year solar quasi-biennial oscillations are synchronous with maximum Sun-planet alignments