[A-CC29] アイスコアと古環境モデリング

[ACC29-18] ドームふじアイスコアの10Be分析による単年宇宙線イベントの調査II

*三宅 芙沙¹、堀内 一穂²、櫻井 敬久³、増田 公明¹、本山 秀明⁴、松崎 浩之⁵、望月 優子⁶、高橋 和也⁶、中井 陽一⁶ (1.名古屋大学宇宙地球環境研究所、2.弘前大学大学院理工学研究科 、3.山形大学理学部、4.情報・システム研究機構　国立極地研究所 、5.東京大学総合研究博物館、6.理化学研究所 )

キーワード：宇宙線生成核種、宇宙線イベント

Cosmogenic nuclides such as ¹⁴C and ¹⁰Be are produced by incoming cosmic rays and therefore their concentrations in natural archive samples record the past cosmic ray intensities.

It has been reported rapid ¹⁴C increases in tree-rings for the periods AD 775, AD 994, 660 BC, 3371 BC and 5480 BC. Although it has been proposed that an origin of these events relates to solar energetic particles, information of production ratio between different nuclides are needed to determine the origin. As for the AD 775 and the AD 994 cosmic ray events, increments of concentrations in ¹⁴C (tree-rings), ¹⁰Be and ³⁶Cl (ice cores) were detected, and it has been reported that the origin of the events is not contradictory to extreme Solar Proton Event.

In this presentation, we will report the results of quasi-annual ¹⁰Be measurements of ice core from Dome Fuji around ca. 660 BC.