The sunspot cycle recorded in the thermoluminescence profile of the GT89/3 Ionian Sea core.

Physics

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Solar-Terrestrial Relations: Solar Activity Cycles

Scientific paper

The authors measured the thermoluminescence (TL) depth profile of the GT89/3 shallow-water Ionian Sea core. This profile has been transformed into a time series using the accurate sedimentation rate previously determined by radiometric and tephroanalysis methods. The TL measurements were performed in samples of equal thickness of 2 mm, corresponding to a time interval of 3.096 y. The TL time series spans 1800 y. The DFT power spectral densities in the decadal periodicity range of this TL series show significant periodicities at 10.7, 11.3 and 12 y closely similar to the periodicities present in the sunspot number series. These results confirm that the TL signal in recent sea sediments faithfully records the solar variability, as the authors previously proposed.

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