THE WAVELET ANALYSIS OF THE SOLAR AND COSMIC RAY DATA

Rybak, J., Antalova, A. (1), Storini, M. (2)

(1) Astronomical Institute, 059 60 Tatranská Lomnica, The Slovak Republic (2) Instituto di Fisica dello Spazio Interplanetario/CNR, Area di Ricerca Roma--Tor Vergata, Via del Fosso del Cavaliere, 100 - 00133 Roma, Italy, and Raggi Cosmici - Dip. di Fisica - UniRomaTre, Via della Vasca Navale, 84 - 00146 Roma, Italy

We present the results of the wavelet power spectrum (WPS) analysis, which covers the 1969-1998 years. The WPS is given for daily data of the following three parameters: (i) the Mt. Wilson Magnetic Plage Strength index (MPSI), (ii) the solar LDE-type flare index (LDE-FI) and (iii) the Calgary cosmic ray (CR) intensity, for the periods ranging from 64 to 1024 days. The temporal distribution of the WPS during the last three solar activity cycles is extremely discontinuous, speaking strongly for the reliability of the Gnevyshev gap concept introduced by the Rome Cosmic Ray Group (e.g. Feminella and Storini, 1997 and references therein). In the 22nd cycle we found the resemblance between the CR and LDE--FI WPS. The CR multiperiod peak (obtained in 1982) can well be identified with the WPS peaks obtained in the both solar parameters under consideration. In the MPSI, we found the periods around 850-880 days (2.3-2.4 yr), in the 21st cycle, but in the LDE-FI there are present in the 22nd cycle. In the CR data we discerned the period around 650 days (1.7 yr).