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This paper presents the results of our measurements of radiocarbon content in Japanese cedar trees for 1557–1629AD, the interval of two grand solar minima called the Spoerer and the Maunder minima. We had measured the radiocarbon content around the Spoerer and the Maunder minima, aiming to clarify the characteristics of the 11-year solar cycle during prolonged sunspot minima. The time series of radiocarbon...
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