Periodicity studies of solar neutrino signals at the Sudbury Neutrino Observatory

The Sudbury Neutrino Observatory collaboration has performed a search for sinusoidal periodicity in the $^{8}$B solar neutrino flux, and has found no evidence of variations for periods between 1 day and 10 years. I describe here an effort to use the Rayleigh Power Test to probe periodicities in the SNO data in a higher frequency range than has been previously sampled ($>$ 1 day$^{-1})$. This has the advantage of sensitivity to neutrino flux variations that might arise due to solar oscillatory activity, particularly gravitational mode oscillations (``g-mode'' oscillations), which are confined to the interior of the sun.