Short‐time variations of the solar neutrino luminosity (Fourier analysis of the argon‐37 production rate data)

We continue the Fourier analysis of the argon‐37 production rate for runs 18–80 observed in Davis’ well known solar neutrino experiment. The method of Fourier analysis with the unequally‐spaced data of Davis and associates is described and the discovered periods we compare with our recently published results for the analysis of runs 18–69 (Haubold and Gerth, 1983). The harmonic analysis of the data of runs 18–80 shows time variations of the solar neutrino flux with periods π=8.33; 5.26; 2.13; 1.56; 0.83; 0.64; 0.54; and 0.50 years, respectively, which confirms our earlier computations.