Abstract
We analyzed the 9-day mean series of the daily international sunspot nirber in the period 1932–1982 and found that it is a complex dynamic system which should be described by at least seven independent variables, that its correlation dimension is 6.3 ± 0.1, that the 2-order Renyi entropy and the maximum Lyapunov exponent are 0.37±0.02and0.34±0.01 bit/ yr, respectively. The corresponding error doubling times are 2.7±0.2 and 2.9±0.1 yr.
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