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《Chinese Journal of Space Science》 1990-01
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DIMENSION AND PREDICTION OF THE SUNSPOT

Shen Mei Yang Pei-cai(Institute of Atmospheric Physics, Academia Sinica, Beijing)  
In this paper the 9 days meaned series of the dayly international sunspot numbers from 1932-1982 are used to analyse the dynamical properties of the sunspots evolution. It is concluded that the sunspot is a complex dynamical system which should be described by at least seven independent variables, and that its correlation dimension is 6.3 ± 0.1, the 2-order Renyi entropy and the maximum Lyapunov exponent are respectively (0.37 ±0.02) bit/yr. The predictable time scales that they indicate, namely, the time for initial error becoming 2 times larger, are (2.7±0.2) years and (2.9±0.1) years, respectively.
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