A Note on Solar Cycle Length during the Medieval Climate Anomaly

Details A Note on Solar Cycle Length during the Medieval Climate Anomaly A Note on Solar Cycle Length during the Medieval Climate Anomaly

2012-03-05

arxiv.org/abs/1203.1073v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 3 figures, to be published in Solar Physics

Scientific paper

The growing interest in the "Medieval Climate Anomaly" (MCA) and its possible link to anomalous solar activity has prompted new reconstructions of solar activity based on cosmogenic radionuclides. These proxies however do not sufficiently constrain the Total Solar Irradiance (TSI) range, and are often defined at low temporal resolution, inadequate to infer the solar cycle length (SCL). We have reconstructed the SCL (average duration of 10.72 \pm 0.20 years) during the MCA using observations of naked-eye sunspot and aurora sightings. Thus, solar activity was most probably not exceptionally intense, supporting the view that internal variability of the coupled ocean-atmosphere system was the main driver of MCA.

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