Reconstruction of solar activity for the last millenium using 10Be data
Reconstruction of solar activity for the last millenium using 10Be data
复制标题
使用 10Be 数据重建上个千年的太阳活动
DOI：
10.1051/0004-6361:20031533
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发表时间：
2003
影响因子：
6.5
通讯作者：
K. Alanko
中科院分区：
文献类型：
--
作者：
I. Usoskin;K. Mursula;S. Solanki;M. Schuessler;K. Alanko
在最近的一篇论文（Usoskin等人，2002年a）中，我们通过使用地球大气中10 Be产生、日光层中宇宙射线传输和太阳开放磁通量演变的物理模型，从测量的太阳黑子数量重建了冰芯中宇宙成因10 Be同位素的浓度。在这里，我们采取相反的路线：从南极洲和格陵兰岛冰芯中测量的10 Be浓度开始，我们反演模型，以重建自公元850年以来11年的平均太阳黑子数量。通过与1610年以来直接观测的太阳黑子数对比，验证了反演方法的有效性。重建的太阳黑子记录显示了一个大约600年的显著周期，与早期基于宇宙成因同位素的观测结果一致。此外，有证据表明存在世纪尺度的格雷斯堡周期和一些较短的准周期，其周期似乎在千年时间尺度上波动。这使以前对太阳黑子活动在较长时间间隔内的多谐波表示的外推失效。
In a recent paper (Usoskin et al. 2002a), we have reconstructed the concentration of the cosmogenic 10 Be isotope in ice cores from the measured sunspot numbers by using physical models for 10 Be production in the Earth's atmosphere, cosmic ray transport in the heliosphere, and evolution of the Sun's open magnetic flux. Here we take the opposite route: starting from the 10 Be concentration measured in ice cores from Antarctica and Greenland, we invert the models in order to reconstruct the 11-year averaged sunspot numbers since 850 AD. The inversion method is validated by comparing the reconstructed sunspot numbers with the directly observed sunspot record since 1610. The reconstructed sunspot record exhibits a prominent period of about 600 years, in agreement with earlier observations based on cosmogenic isotopes. Also, there is evidence for the century scale Gleissberg cycle and a number of shorter quasi-periodicities whose periods seem to fluctuate in the millennium time scale. This invalidates the earlier extrapolation of multi-harmonic representation of sunspot activity over extended time intervals.