Solar Physics

, Volume 290, Issue 5, pp 1457–1477 | Cite as

On the Verge of a Grand Solar Minimum: A Second Maunder Minimum?

  • L. ZachilasEmail author
  • A. Gkana


We analyze the yearly mean sunspot-number data covering the period 1700 to 2012. We show that the yearly sunspot number is a low-dimensional deterministic chaotic system. We perform future predictions trying to forecast the solar activity during the next five years (2013 – 2017). We provide evidence that the yearly sunspot-number data can be used for long-term predictions. To test and prove that our model is able to predict the Maunder Minimum period (1645 – 1715), we perform long-term post-facto predictions comparing them with the observed sunspot-number values. We also perform long-term future predictions trying to forecast the solar activity up to 2102. Our predictions indicate that the present Cycle 24 is expected to be a low-peak cycle. We conclude that the level of solar activity is likely to be reduced significantly during the next 90 years, somewhat resembling the Maunder Minimum period.


Yearly sunspot number Grand solar minimum Maunder Minimum, solar activity predictions Deterministic chaos 



We would like to thank J.H. Seiradakis for introducing us to Hoyt and Schatten’s (1998) solar-activity reconstruction and for constructive suggestions. We would also like to thank J.M. Pasachoff for providing the Maunder (1922) article and for some fruitful suggestions.


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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Department of EconomicsUniversity of ThessalyVolosGreece

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