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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Volume 1, issue 1
Nonlin. Processes Geophys., 1, 72-76, 1994
https://doi.org/10.5194/npg-1-72-1994
© Author(s) 1994. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Including papers presented at the AGU Chapman Conference on...

Nonlin. Processes Geophys., 1, 72-76, 1994
https://doi.org/10.5194/npg-1-72-1994
© Author(s) 1994. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  31 Mar 1994

31 Mar 1994

Testing for nonlinearity in radiocarbon data

J. Kurths1, U. Schwarz1, C. P. Sonett2, and U. Parlitz3 J. Kurths et al.
  • 1Max-Planck-Arbeitsgruppe Nichtlineare Dynamik, Universität Potsdam, Am neuen Palais, Postfach 601553, D-14415 Potsdam, Germany
  • 2University of Arizona, Lunar and Planetary Laboratory, Tuscon, Arizona 85721, USA
  • 3Institut für Angewandte Physik, Technische Hochschule Darmstadt, Schloßstraße 7, D-64289 Darmstadt, Germany

Abstract. The radiocarbon record that has been extended from 7199 BC to 1891 AD is of fundamental importance to understand century-scale variations of solar activity. We have, therefore, studied how to extract information from dynamic reconstructions of this observational record.
Using some rather unusual methods of nonlinear dynamics, we have found that the data are significantly different from linear coloured noise and that there is some evidence of nonlinear behaviour. The method of recurrence plots exhibits that the grand minima of solar activity are quite different in their recurrence. Most remarkably, it suggests that the recent epoch seems to be similar to the Medieval maximum.

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