Solar variability and ring widths in fossil trees.

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Solar-Terrestrial Relations

Scientific paper

Analyses ring width sequences of 1.3 My old fossil trees, grown with no water deficit, in Dunarobba forest (Italy). The authors find evidence for a modulation period of the annual ring growth widths on time scale of 11 y to 15 y. Since similar modulation cycles have also been found by other authors in the polar ice 10Be concentration of the last millennium and in a series of annual ring widths of the same kind of trees grown in central Europe of 15 - 20 My ago, the authors suggest that such cycles might be related to solar-activity cycles. This should support the hypothesis of a quasi-periodic behaviour of the solar dynamical system controlled by an oscillator whose fundamental period is of 22 - 25 y, that can be identified with the Hale cycle; this system would have been operational at least since the Miocene era.

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