Recurrent Large‐Scale Solar Proton Events Before the Onset of the Wolf Grand Solar Minimum
Recurrent Large‐Scale Solar Proton Events Before the Onset of the Wolf Grand Solar Minimum
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DOI：
10.1029/2021gl097201
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发表时间：
2022-02
影响因子：
5.2
通讯作者：
H. Miyahara;F. Tokanai;T. Moriya;M. Takeyama;H. Sakurai;M. Ohyama;K. Horiuchi;H. Hotta
中科院分区：
文献类型：
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作者：
H. Miyahara;F. Tokanai;T. Moriya;M. Takeyama;H. Sakurai;M. Ohyama;K. Horiuchi;H. Hotta
树木年轮中的碳 - 14表明，过去曾发生过多次极端太阳质子事件（SPEs）。虽然像公元774 - 775年这样的大型事件可以通过加速器质谱的典型精度显著检测到，但较小但可能更频繁的事件却难以检测。因此，这类相对较小事件的发生频率或任何特征在很大程度上仍然未知。在本文中，我们报告基于高精度的碳 - 14分析，在沃尔夫极小期开始之前的公元1261 - 1262年、1268 - 1269年和1279 - 1280年发生了大型太阳质子事件。这表明它们发生在太阳活动周期的极大期和下降阶段，以及太阳活动向深度极小期过渡的时期。我们提出，这一事件可能为阐明太阳发电机与极端太阳耀斑之间的潜在相互作用提供一个独特的机会。
Carbon‐14 in tree rings have suggested there had been multiple extreme solar proton events (SPEs) in the past. While the largest events such as in 774–775 CE can be significantly detected by the typical precision of accelerator mass spectrometry, smaller but possibly more frequent events have been difficult to be detected. Thus, the frequency or any characteristics of such relatively smaller events are still largely unknown. In this paper, we report that large SPEs had occurred in 1261–1262, 1268–1269, and 1279–1280 CE before the onset of the Wolf minimum based on high‐precision carbon‐14 analyses. It is suggested that they had occurred at the maximum and the declining phase of solar cycles, and that they had occurred during the transition time of solar activity into a deep minimum. We propose that this episode may provide a unique opportunity to elucidate a potential interaction between the solar dynamo and extreme solar flares.