الفهرس 
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Abstract
Daily average of neutron component of cosmic rays measured at four stations coverind wide cutoff rigidity range are analyzed. Results indicate a flat spectrum frequency less than 5×10-7 Hz, and a power spectrum dependence of the from f-n, with index n varies between 2 and 5.7 and depending on solar activity cycle for higher frequencies A linear increase of correlation time with rigidity is also observed. the harmonic coefficients of the twenty-seven day fourier expansion have been also studied.