Phys. Rev. Lett. 91, 211101 (2003) [4 pages]

Millennium-Scale Sunspot Number Reconstruction: Evidence for an Unusually Active Sun since the 1940s

PRL Celebrates 50 Years

This Week's Milestone Letters are from 1984:
Milestone Letter: Metallic Phase with Long-Range Orientational Order and No Translational Symmetry

Abstract

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Citing Articles (18)

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Ilya G. Usoskin ^*
Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, FIN-90014 Oulu, Finland

Sami K. Solanki ^† and Manfred Schüssler
Max-Planck Institut für Aeronomie, Katlenburg-Lindau, Germany

Kalevi Mursula and Katja Alanko
Department of Physical Sciences, University of Oulu, FIN-90014 Oulu, Finland

Featured in Physics News Update Received 9 July 2003; published 19 November 2003

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 ¹⁰Be 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 ¹⁰Be 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.

URL: http://link.aps.org/abstract/PRL/v91/e211101
DOI: 10.1103/PhysRevLett.91.211101
PACS: 96.60.Qc, 96.40.Kk

^* Electronic address: Ilya.Usoskin@oulu.fi
^† Electronic address: Solanki@linmpi.mpg.de

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Phys. Rev. Lett. 91, 211101 (2003) [4 pages]

Millennium-Scale Sunspot Number Reconstruction: Evidence for an Unusually Active Sun since the 1940s

PRL Celebrates 50 Years

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