VARIABILITY OF COSMIC-RAY POWER SPECTRA

Variability of the power spectra of cosmic ray temporal profiles in th e frequency interval 1.2 x 10(-5) Hz (f(1)) to 1.7 x 10(-3) Hz (f(2)) in the period of two years shows that the integrals of power spectrum density over the interval f(1) to 2.8 x 10(-4) Hz (P-1) are significan tly correlated at two neutron monitors differing in acceptance cones a nd cut-off rigidities. At high frequency region, f > 2.8 x 10(-4) Hz, the integrals P-2 are correlated much less. P-1 are weakly correlated with the cosmic ray intensity itself. Cross correlation between the ti me series P-1 and the daily averages of geomagnetic indices (<(Kp)over bar>, (Dst) over bar and Ap) is asymmetric, with the maximum shifted to positive time lag. This indicates the stronger relation of the dail y averaged geomagnetic indices measured for given day with the P-1 obt ained a day before, than with the P-1 at the same day. The shift is no t obtained if cosmic ray intensity, instead of P-1, is cross-correlate d with geomagnetic indices.