A Millennium Scale Sunspot Number Reconstruction: Evidence For an Unusually Active Sun Since the 1940's

Details A Millennium Scale Sunspot Number Reconstruction: Evidence For an Unusually Active Sun Since the 1940's A Millennium Scale Sunspot Number Reconstruction: Evidence For an Unusually Active Sun Since the 1940's

2003-10-29

arxiv.org/abs/astro-ph/0310823v1

Phys.Rev.Lett. 91 (2003) 211101

Astronomy and Astrophysics

Astrophysics

4 pages, LaTeX, revtex4 macros; Phys. Rev. Let., in press

Scientific paper

10.1103/PhysRevLett.91.211101

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 Be-10 concentration in polar ice to reconstruct the average sunspot activity level for the period between the year 850 to the pr esent. Our method uses physical models for processes connecting the Be-10 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

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