The solar cycle during the last 500 years inferred from Radiocarbon

Details The solar cycle during the last 500 years inferred from Radiocarbon The solar cycle during the last 500 years inferred from Radiocarbon

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh21a0324m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH21A-0324

Physics

1650 Solar Variability (7537), 4918 Cosmogenic Isotopes (1150), 7536 Solar Activity Cycle (2162), 7974 Solar Effects

Scientific paper

The 11-yr solar cycle strongly influences the modulation of the galactic cosmic rays reaching the Earth's atmosphere. For the last 50 years the neutron monitor data nicely show the 11-yr cycle in cosmic rays. Further back in time cosmogenic radionuclides (such as 10Be and 14C) can be used as proxies for the varying cosmic ray flux and therefore also as indicators of the varying solar activity. We will present new results based on annually resolved tree-ring Radiocarbon (14C) data (Stuiver et al., 1998) that allow us to trace back the 11-yr cycle for the last 500 years. There is a high agreement of the short-term (11yr) changes in 14C and sunspots but there are also distinct differences. As 10Be from ice cores, 14C points to an ongoing solar cycle during the Maunder minimum and, unlike the sunspot number, the level of solar modulation can be very different for different solar minima (Muscheler et al., QSR in press). References: Stuiver, M., Reimer, P.J., Braziunas, T.F., 1998. High-precision radiocarbon age calibration for terrestrial and marine samples. Radiocarbon 40, 1127 1151. Muscheler, R., et al., Solar activity during the last 1000yr inferred from radionuclide records, Quaternary Science Reviews (2006), doi:10.1016/j.quascirev.2006.07.012.

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