## The Low Frequency Power Spectrum of Cosmic-ray Variations During IGY |

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27-day variation actual analysis Appendix approach approximately associated assume autocorrelation average band Bev/c calculated Center changes close computation constant contained contribute correction correlation Cosmic Radiation Cosmic-Ray Intensity cosmic-ray variations counting rate covered cutoff rigidity cycle daily December define density distribution earth Energy equal Equation equivalent amplitude estimate Field Figure follows Forbush decreases Forbush events Fourier function hand harmonic indices intervals irregular July latitude dependence length limit low frequency magnetic activity magnetic storms March mean measurements method neutron monitor noise normalized noted obtained peak period phase Phys points power spectrum present primary probability Proc proportional Ray Intensity record recurrence tendencies Reference REVIEW sampled shows signal solar activity Space Spectra spectrum of cosmic-ray station statistical fluctuations superimposed Table taken tends tion transform undergoes values various voltage York zero