Abstract
Different records of solar activity (Wolf and group sunspot number, data on cosmogenic isotopes, historic data) were analyzed by means of modern statistical methods, including one espe- cially developed for this purpose. It was confirmed that two long-term variations in solar activity - the cycles of Gleissberg and Suess - can be distinguished at least during the last millennium. The results also show that the century-type cycle of Gleissberg has a wide frequency band with a double structure consisting of 50 - 80 years and 90 - 140 year periodicities. The structure of the Suess cycle is less complex showing a variation with a period of 170 - 260 years. Strong variability in Gleissberg and Suess frequency bands was found in northern hemisphere temperature multiproxy that confirms the existence of a long-term relationship between solar activity and terrestial climate.
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