On the Shape of Cosmic Ray Modulation during Even- and Odd-numbered Solar Activity Cycles

M. Storini (1), S. Massetti (1), K. Kudela (2), J. Rybák (3)

1 - Institute for Interplanetary Space Physics, National Research Council, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy
2 - Inst. Experimental Physics, SAS, Watsonova 47, 04353 Kosice, Slovakia
3 - Astronomical Institute, Slovak Academy of Sciences, SK-05960 Tatranská Lomnica, Slovakia

Data from several neutron monitors are used to investigate the cosmic ray modulation for different rigidity intervals in the period 1953-2002. From the shape of the cosmic ray modulation it turns out that the ~1.3-yr periodicity, identified also by the use of the wavelet technique, results highly significant during the second stage of cosmic ray modulation in even/odd heliomagnetic semicycles.

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