首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Multiradionuclide evidence for an extreme solar proton event around 2610 B.P. (∼660 BC)
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Multiradionuclide evidence for an extreme solar proton event around 2610 B.P. (∼660 BC)

机译:多放射性核素证明了公元前2610年左右发生的极端太阳质子事件。 (约前660年)

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摘要

Recently, it has been confirmed that extreme solar proton events can lead to significantly increased atmospheric production rates of cosmogenic radionuclides. Evidence of such events is recorded in annually resolved natural archives, such as tree rings [carbon-14 (14C)] and ice cores [beryllium-10 (10Be), chlorine-36 (36Cl)]. Here, we show evidence for an extreme solar event around 2,610 years B.P. (∼660 BC) based on high-resolution 10Be data from two Greenland ice cores. Our conclusions are supported by modeled 14C production rates for the same period. Using existing 36Cl ice core data in conjunction with 10Be, we further show that this solar event was characterized by a very hard energy spectrum. These results indicate that the 2,610-years B.P. event was an order of magnitude stronger than any solar event recorded during the instrumental period and comparable with the solar proton event of AD 774/775, the largest solar event known to date. The results illustrate the importance of multiple ice core radionuclide measurements for the reliable identification of short-term production rate increases and the assessment of their origins.
机译:近来,已经证实极端的太阳质子事件可以导致宇宙产生的放射性核素的大气生产率大大提高。此类事件的证据记录在每年解析的自然档案中,例如年轮[carbon-14( 14 C)]和冰芯[铍10( 10 Be) ,氯-36( 36 Cl)]。在这里,我们显示了大约公元前2,610年的极端太阳事件的证据。 (〜660 BC)基于来自两个格陵兰冰芯的高分辨率 10 Be数据。同期模拟的 14 C生产率支持了我们的结论。将现有的 36 Cl冰芯数据与 10 Be结合使用,我们进一步表明,该太阳事件的特征是非常坚硬的能谱。这些结果表明公元前2,610年该事件比仪器时期记录的任何太阳事件都要强一个数量级,可与公元774/775年的太阳质子事件相媲美,这是迄今为止已知的最大太阳事件。结果表明,多次冰芯放射性核素测量对于可靠地确定短期产量增加和评估其成因的重要性。

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