Annually resolved radiocarbon (14C) measurements on tree rings led to the discovery of abrupt variations in 14C production attributed to large solar flares. We present new results of annual and subannual 14C fluctuations in tree rings from a middle-latitude sequoia (California) and a high-latitude pine (Finland), analyzed for the period 1030–1080 CE, to trace a possible impact of the Crab supernova explosion, occurring during the Oort minimum of solar activity. Our results indicate an increase of Δ14C around 1054/55 CE, which we estimate is higher in magnitude than the cyclic variability due to solar activity at a 2σ significance level. The net signal appears to be synchronized in the studied locations. Several sources of this event are possible including γ-rays from the Crab supernova, an unusually weak solar minimum or a solar energetic particle incident. More data are needed to provide more insight into the origin of this 14C event.

中文翻译：

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1055 CE 中的 14C 生产会受到 SN1054 的影响吗？

每年分解的放射性碳 (14C) 对树木年轮的测量导致发现了年轮的突然变化14C 产生归因于大型太阳耀斑。我们提供年度和次年度的新结果14中纬度红杉（加利福尼亚）和高纬度松树（芬兰）的年轮 C 波动，分析了公元 1030 年至 1080 年期间，以追踪发生在奥尔特极小期期间的螃蟹超新星爆炸的可能影响太阳活动。我们的结果表明Δ增加14C 大约在公元 1054/55 年左右，我们估计其幅度高于由于太阳活动而导致的 2σ 显着性水平的循环变率。网络信号在所研究的位置似乎是同步的。这一事件的几个来源是可能的，包括来自螃蟹超新星的 γ 射线、异常弱的太阳极小期或太阳高能粒子事件。需要更多的数据来更深入地了解这种情况的起源14C 事件。