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

Rybak J. (1), Antalova, A. (1), Storini, M.

(1) Astronomical Institute, 059 60 Tatranská Lomnica, The Slovak Republic
(2) IFSI/CNR, Area di Ricerca Roma-Tor Vergata, Via del Fosso del Cavaliere, 100 - 00133 Roma, Italy


Wavelet transform has been used for the time-frequency decomposition of solar data series through the last three solar cycles (the 20-th, the 21-st and the 22-nd), on daily basis, for the following parameters: the non-flare full-disk soft X-ray background (XBG), the daily solar LDE-type flare index (LDE) and the daily impulsive-type flare index (IMP). From the wavelet analysis we can distinguish the existence of discrete impulses of the intermediate-term periodicities (IP) during the 1969-1998 year interval. The impulses were determined in the following years: 1981.0, 1982.7, 1990.0, 1991.6 . It is very likely, that obtained impulsive episodes indicate those time intervals, in which the continuing eruption of the new solar magnetic flux existed.