Variation of solar cyclicity during the Spoerer Minimum
Abstract
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.
- Publication:
-
Journal of Geophysical Research (Space Physics)
- Pub Date:
- March 2006
- DOI:
- 10.1029/2005JA011016
- Bibcode:
- 2006JGRA..111.3103M
- Keywords:
-
- Global Change: Solar variability (7537);
- Interplanetary Physics: Cosmic rays;
- Interplanetary Physics: Solar cycle variations (7536);
- Paleoceanography: Cosmogenic isotopes (1150);
- solar activity;
- Spoerer Minimum;
- carbon 14