Summary
Five ofBerlage's eight empirical rules concerning the Southern Oscillation (1957) may be united in one general rule with regard to the different influence of solar activity during 11-year sunspot cycles with annual maximum numberR above or below 85 (Tables 2, 3, 4, 5 and 6). The opposite character of strong and weak 11-year cycles of solar activity is also present in the 7-year period (Tables 7, 8, 9 and 10; Fig. 1). Finally it is shown that a similar contrast obviously exists in the appearance of polar lights (Table 11, Fig. 2 and 3).
The results have not been statistically tested. Because of the rather small number of solar periods involved and the complicated character of the relations found, I could not find a satisfactory statistical method to operate with. I may emphasize, however, the ≪converging evidence≫ enlarging considerably the statistical significance of my results.
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Visser, S.W. On the connections between the 11-year sunspot period and the periods of about 3 and 7 years in world weather. Geofisica Pura e Applicata 43, 302–318 (1959). https://doi.org/10.1007/BF01993567
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DOI: https://doi.org/10.1007/BF01993567