THE VARIATIONS OF THE SOLAR ACTIVITY AND THE LOW RIGIDITY COSMIC RAYS (1969-1998)

Antalova, A. (1), Kudela, K. (1) and Rybak J. (2)

(1) Institute of the Experimental Physics, Watson street 47, 043 53 Kosice,
(2) Astronomical Institute, 059 60 Tatranská Lomnica, The Slovak Republic

The wavelet power spectra were calculated and compared for the whole solar disk time series: the Mt. Wilson Magnetic Plage Strength Index (MPSI) and the Mt. Wilson Sunspot Index (MWSI) as well as the low rigidity Calgary cosmic rays (CR). The intermediate- and the long-term periodicities are established during a 6-year interval of the respective cycle (2 years before and 4 years after the cycle maximum). The periodicities longer than 100 days are dominant in the post-maximum years. The 260-day period of the MPSI has dual structure, the peaks are in 1979 and in 1981-1982 post-maximum years. We found, that the well known long-term cosmic ray periodicity 1.5 - 1.7 year is present in the low rigidity Calgary cosmic rays, in 1983.5 and in 1991.0 years.