Unusual activity of the Sun during recent decades compared to the previous 11,000 years

  title={Unusual activity of the Sun during recent decades compared to the previous 11,000 years},
  author={Sami K. Solanki and Ilya G. Usoskin and Bernd Kromer and M. Sch{\"u}ssler and J{\"u}rg Beer},
Direct observations of sunspot numbers are available for the past four centuries, but longer time series are required, for example, for the identification of a possible solar influence on climate and for testing models of the solar dynamo. Here we report a reconstruction of the sunspot number covering the past 11,400 years, based on dendrochronologically dated radiocarbon concentrations. We combine physics-based models for each of the processes connecting the radiocarbon concentration with… 
Prediction of solar activity for the next 500 years
Recently, a new low‐noise record of solar activity has been reconstructed for the past 9400 years by combining two 10Be records from Greenland and Antarctica with 14C from tree rings [Steinhilber et
Solar activity reconstructed over the last 7000 years: The influence of geomagnetic field changes
The long‐term solar activity, as manifested by sunspot number, has been recently reconstructed on multi‐millennium time scales by S. K. Solanki et al. (2004) from the measured concentration of 14C in
A new approach to the long-term reconstruction of the solar irradiance leads to large historical solar forcing
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Was the solar activity in the last 100 years abnormally high? On the quality of modern solar paleoreconstructions
A technique for verifying the currently available reconstructions of solar activity in the preinstrumental epoch (prior to 1615 AD), covering time intervals up to 10 000 years, has been developed and
Revisiting the Sunspot Number A 400-Year Perspective on the Solar Cycle
Our knowledge of the long-term evolution of solar activity and of its primary modulation, the 11-year cycle, largely depends on a single direct observational record: the visual sunspot counts that
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We have studied solar variations during the Holocene (i.e., last ∼11,700 yr) by combining a new model of the Earth's dipole moment with 14C data from the IntCal04 record and 10Be data from the GRIP
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Grand minima of solar activity during the last millennia
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On the Possibility of Forecasting the Sun's Activity Using Radiocarbon Solar Proxy
Group sunspot number (GSN) values, averaged over decades, were reconstructed for a time interval 8505 BC–AD 1945 using data on the concentration of radiocarbon in tree rings. The prediction of an


Reconstruction of solar activity for the last millenium using 10Be data
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
Long-term indirect indices of solar variability
  • J. Beer
  • Environmental Science, Physics
  • 2000
Continuous direct records of solar variability are limited to the telescopic era covering approximately the past four centuries. For longer records one has to rely on indirect indices such as
Evolution of the Sun's large-scale magnetic field since the Maunder minimum
A model describing the long-term evolution of the Sun's large-scale magnetic field reproduces the doubling of the interplanetary field and indicates that there is a direct connection between the length of the sunspot cycle and the secular variations.
Use of 10Be in polar ice to trace the 11-year cycle of solar activity
A DETAILED knowledge of the history of solar magnetic activity is important in several respects. From satellite data there is increasing evidence that solar magnetic activity and solar irradiance are
Can solar variability explain global warming since 1970
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Secular variation of the Sun's magnetic flux
We present an extension of the model of Solanki et al. (2000) that allows us to reconstruct the time evolution of both the total and the open magnetic flux at the solar surface since 1700. The flux
Sun, ocean, climate and atmospheric 14CO2 : an evaluation of causal and spectral relationships
Solar (heliomagnetic), geomagnetic and oceanic forcing all play a role in atmospheric 14CO2 change. Here we assign the variance associated with certain periodicities in a single year (0-450 cal. BP)