The atmospheric activity of Jupiter exhibits quasi-periodic character
attributed to the stochastic nature of the involved mechanisms. Period
icities between 4-33 years are obtained employing four spectrum analys
is methods, (power spectrum employing the Blackman-Tukey window, maxim
um entropy, Fourier, autocorrelation), whilst, their significance and
their stationarity has been established with the application of genera
l statistical tests (Kolmogorov-Smirnov, one sample and two sample tes
t, randomness test, chi-square, various orders of autoregressive proce
ss, analysis of truncated records).