The Sunspot and Auroral Activity Cycle Derived from Korean Historical Records of the 11th–18th Century
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Historical records of sunspots and aurorae are valuable information to examine variations of solar activity and the terrestrial climate on a long-term scale. We have collected the historical records of Korea during the 11th–18th century. Through a power-spectrum analysis of these data, we have found solar activity cycles, which coincide with the Schwabe cycle and the Gleissberg cycle on short and long-term periods, respectively.
Keywords18th Century Solar Activity Historical Record Activity Cycle Solar Activity Cycle
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