PHASE EVOLUTION OF SOLAR ACTIVITY AND COSMIC-RAY VARIATION CYCLES |
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Authors: | Usoskin I G Kovaltsov G A Kananen H Mursula K Tanskanen P J |
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Institution: | (1) A.F. Ioffe Physical-technical Institute, 194021 St. Petersburg, Russia;(2) University of Oulu, FIN-90570 Oulu, Finland |
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Abstract: | Cycles of phase evolution of solar activity and cosmic-ray variations are reconstructed by means of the delay component method, which allows us to study the temporal behaviour of time lag between solar activity and cosmic-ray cycle phases. It is shown that the period of the late 20th cycle was very unusual. We have found a delay in the phase of the solar activity cycle with respect to that of cosmic rays and discuss the heliospheric conditions responsible for this delay. |
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