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DURATION OF 11-YEAR CYCLE OF SOLAR ACTIVITY BY DATA OF HISTORICAL CHRONICLES OVER THE LAST TWO MILLENNIA Ivanov V.G., Ivanova K.G., Nagovitsyn Yu.A.
Central astronomical observatory of RAS, Saint-Petersburg, Russia, ivanovv@gao.spb.ru Abstract The data of ancient manuscripts on the naked-eye sunspot observations and the middle- and low-latitude observations of aurorae are used for reconstruction, by means of method based on wavelet analysis, of the 11-year cycle length variations over the last two millennia. The obtained variations are compared with the corresponding data following from the Schove catalogue of the sunspot activity extrema.

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