1985•NASA STI Repository (National Aeronautics and Space Administration)Open access
11- and 22-year variations of the cosmic ray density and of the solar wind speed
N. P. Chirkov
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Abstract
Cosmic ray density variations for 17-21 solar activity cycles and the solar wind speed for 20-21 events are investigated. The 22-year solar wind speed recurrence was found in even and odd cycles. The 22-year variations of cosmic ray density were found to be opposite that of solar wind speed and solar activity. The account of solar wind speed in 11-year variations significantly decreases the modulation region of cosmic rays when E = 10-20 GeV.
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