On the wavelet approach to cosmic ray variability

Details On the wavelet approach to cosmic ray variability On the wavelet approach to cosmic ray variability

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3773k&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

A wavelet transform (time scale ~60 to ~1000 days) is applied on the long-term time series of daily means of cosmic ray intensity observed by neutron monitors at different cutoff rigidities. No persistent periodicities with the same amplitude are found for the whole period analyzed. The temporal evolution of quasiperiodic variations at ~150 days, ~1.3 years and ~1.7 years is examined. While the ~1.7-y quasiperiodicity (the most remarkable one in the studied interval) is strongly contributing to the cosmic ray intensity profile of solar cycle 21 (particularly in 1982), the ~1.3-y one (which is better correlated with the same periodicity of the interplanetary magnetic field strength) is a characteristic feature for the decreasing phases of the cycles 20 and 22. Transitions between them are seen from the wavelet power spectra plots. Obtained results give a support to the claimed difference in the solar activity evolution during odd and even solar activity cycles.

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