Variation of solar cyclicity during the Spoerer Minimum

Details Variation of solar cyclicity during the Spoerer Minimum Variation of solar cyclicity during the Spoerer Minimum

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11103103m&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A3, CiteID A03103

Physics

4

Global Change: Solar Variability (7537), Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Solar Cycle Variations (7536), Paleoceanography: Cosmogenic Isotopes (1150)

Scientific paper

We investigate the 11-year solar cycle during the Spoerer Minimum (1415-1534 A.D.) by measuring the carbon 14 content in the annual tree rings for the period 1413-1554 A.D. The period of the Spoerer Minimum is assumed to be a prolonged sunspot minimum like the Maunder Minimum (1645-1715 A.D.). However, the 11-year solar cycle, which appears in recent solar variations, was also prominently detected in the carbon 14 record during this period. The amplitude of the 11-year cycle seems to have been modulated only around 1455-1510 A.D.

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