Xu Zhen-tao, Zhao Ai-di, Xue Yi-sheng, Mei Yan-lin
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After reviewing the various methods used so far in the long-term prediction of solar activity, we have opted to use methods based on the 80-year period and probability considerations. Our predictions for Cycle No. 21 are:
1.
Maximum of the annual average Wolf number: 54 – 94
2.
Minimum of the annual average Wolf number: 0 – 4
3.
Epoch of maximum: first half of 1981 - first half of 1983
4.
Epoch of minimum: first half of 1976 - first half of 1977
A comparison of our predictions with others is made.
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