Abstract
Application of new statistical techniques to time series allow the investigation of cosmic-ray intensity variation in the periodicity range of 1 to 10 years. We can put significant levels to the existence of these oscillations and define their character as quasi-periodic and/or recurrent. Correlations between cosmic-ray intensity variations and solar activity changes during 1944–1979 are investigated. The two-year variation in cosmic rays is observed to be variable both in amplitude and phase, and not correlated with sunspot cyclic variations; but seems to depend on the magnetic polarity of the interplanetary medium. No significant evidence for the existence of longer period variations is obtained.
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Attolini, M.R., Cecchini, S. & Galli, M. A search of cosmic-ray variations generated by pulsations of the heliosphere. Astrophys Space Sci 134, 103–114 (1987). https://doi.org/10.1007/BF00636457
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DOI: https://doi.org/10.1007/BF00636457