[P-EM12] Space Weather and Space Climate

[PEM12-P09] High-precision measurement of carbon-14 in tree rings around the onset of the Maunder Minimum

*宮原 ひろ子¹、門叶 冬樹²、森谷 透²、堀田 英之³ (1.武蔵野美術大学、2.山形大学、3.千葉大学)

キーワード：太陽活動周期、太陽活動極小期、宇宙線生成核種

It is well known that the Sun indicates long-term variations at time scales of a few hundred years to a few millennia. It sometimes brings the grand minima, at which period the sunspots disappear for more than several decades. The detailed process of such long-lasting disappearance of sunspots, however, remains unclear. We therefore have been trying to reconstruct solar cycles around the onset of grand minima based on high-precision measurement of carbon-14 in tree rings. In this paper, we report on our preliminary result on the measurement of carbon-14 around the onset of the Maunder Minimum.