Length of 11-year solar cycles

Features of the dynamics and relationship between the parameters of 11-year solar cycles, which were found from different characteristic points of an 11-year cycle, are discussed. The cycle period is determined from the time of the appearance of the first sunspot of a new cycle, which makes it possible to exclude the contributions of cycle overlapping and asymmetry effects to variations in the cycle repetition interval, to reveal the dependence of the 11-year cycle repetition period on the secular cycle, and to ascertain a longer length of an even cycle as compared to an odd one. A change in the length of a 22-year cycle found by this technique is evidence of the presence of lags near secular cycle minima. A strong correlation between the length of the physical cycle decay and the interval between neighboring cycles is revealed. It is found that the dependence of the amplitude of an 11-year cycle on the length of the ascending branch depends on the secular cycle phase.