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Earth, Planets and Space
Figure 5 | Earth, Planets and Space

Figure 5

From: Regional climate pattern during two millennia estimated from annual tree rings of Yaku cedar trees: a hint for solar variability?

Figure 5

Same results as Figure 4 , but for dS variation. Analysis was performed for annual tree rings between 1360 and 1988. Dataset without running average was used. The 11-, 22-, and 24-year periodicities are apparent, confirming the results of the wavelet analysis. Red line indicates amplitude spectrum for MC-generated data that were randomly produced. Compared to the red line, the amplitudes at the 11-year and 22-year periods exceed 3.0 σ and 2.5 σ, respectively. Therefore, it would be difficult to explain these peaks as background fluctuation.

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