2003/10/29 by Ilya G. Usoskin, Ilya Usoskin, Sami K. Solanki +7
Earth and Planetary Sciences · Environmental Science · Mathematics · Physics and Astronomy · #Astronomy #Astrophysics #Climate variability and models #Climatology #Combinatorics #Dynamo #Geology #Geophysics and Gravity Measurements #Interval (graph theory) #Magnetic field #Mathematics #Meteorology #Physics #Polar #Scale (ratio) #Series (stratigraphy) #Solar and Space Plasma Dynamics #Solar cycle #Solar minimum #Sunspot #Sunspot number #astro-ph
paper · pdf · doi:10.1103/physrevlett.91.211101
published as Phys.Rev.Lett. 91 (2003) 211101 · 4 pages, LaTeX, revtex4 macros; Phys. Rev. Let., in press
arxiv created 2003/10/29 · openalex publication_date 2003/11/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The extension of the sunspot number series backward in time is of considerable interest for dynamo theory, solar, stellar, and climate research. We have used records of the (10)Be concentration in polar ice to reconstruct the average sunspot activity level for the period between the year 850 to the present. Our method uses physical models for processes connecting the (10)Be concentration with the sunspot number. The reconstruction shows reliably that the period of high solar activity during the last 60 years is unique throughout the past 1150 years. This nearly triples the time interval for which such a statement could be made previously.