Physics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....3...82f&link_type=abstract
IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Conference Papers. Volume 3 (A85-2
Physics
Carbon 14, Cosmic Rays, Particle Intensity, Solar Activity Effects, Solar Cycles, Amplitude Modulation, Data Correlation, Scintillation Counters, Sunspot Cycle
Scientific paper
A liquid scintillation-photomultiplier tube counter system was used to measure the Delta-C-14 values of 60 tree rings, dating from 1866 to 1925, that were taken from a white spruce grown in Canada at 68 deg N, 130 deg W. A 10-percent variation is found which is anticorrelated with sunspot numbers, although the amplitude of the variation is 2-3 times higher than expected in trees grown at lower latitudes. A large dip in the data at about 1875 suggests an anomalously large modulation of cosmic ray intensity during the 1867-1878 AD solar cycle, which was the most active of the 19th century.
Chen Teng-Ming
Dai Kai-Mei
Fan Chang-Yun
Yun S. X.
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