Time Variations of the Solar Neutrino Flux Data from Sudbury Neutrino   Observatory
  We have used the Ferraz-Mello Method of Date Compensated Discrete Fourier Transform on the solar neutrino flux data from the Sudbury Neutrino Observatory (SNO) in order to search for its time variation. We present results from Ferraz-Mello Method for both pure D2O and salt phase data sets from SNO. For the D2O data the obtained periods are 5.36, 14.99, 23.06, 40.31, 65.63, 115.03, 131.27, 152.67, 188.74, 294.49 and 412.79 days and for the salt phase data the periods are obtained at around 37.84, 43.89, 59.17, 67.48, 72.47, 78.52, 86.54, 95.91, 109.83 and 317.01 days. For all the obtained periods the levels of confidence are sufficiently higher than 95 percent. 
Koushik Ghosh and Probhas Raychaudhuri