Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4143m&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
It is well known that sunspots almost disapp eared in the Maunder Minimum (1645-1715 AD). Accordingly, solar activity in this period has drawn much attention. Investigating the variation of radio carbon contents in tree rings will improve our understanding of the solar activity in a time when the sunspots were absent. In prior studies, Ko charov et al. and Stuiver and Braziunas examined indep endently the variation of the radio carbon content in annual tree rings during the Maunder Minimum. However, their data differ in several points, notably the amplitude of the variation, the periodicities and the absolute peak value of the radio carbon content. In this paper, we present new results on the variation of radio carbon content during the Maunder Minimum in order to clarify which features are regional effects and which are the effect of solar activity. Some radio carbon data from a Japanese cedar tree is presented and compared with the data obtained by Ko charov et al. and Stuiver and Braziunas.
Beer Juerg
Bonani
Furuzawa Hideki
Hajdas Irka
Masuda Kimiaki
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