Physics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....3..995l&link_type=abstract
In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 3. (A76-26851
Physics
Cosmic Rays, Interplanetary Magnetic Fields, Modulation, Particle Intensity, Secular Variations, Solar Activity Effects, Carbon 14, Long Term Effects, Magnetic Effects, Solar Cycles
Scientific paper
The carbon 14 abundance of tree ring samples grown in the same time periods were compared and only those which agreed within statistical limits were selected for the analysis (only 5% of the data were found to be compatible). The data were averaged and combined into 293 25 year samples. The carbon 14 exhibits two kinds of variations: a long term variation on a time scale of roughly 10,350 years and a short term variation due to climatic and heliomagnetic modulation of cosmic ray intensity. The existence of an 80 year cycle is clearly indicated in the covariance function of the residuals. It can be assumed that this 80 year periodicity in the variation of carbon 14 activity is due to the modulation of cosmic ray intensity by interplanetary magnetic fields and must find its origin in the solar activity cycle within the sun.
Damon Paul E.
Fan Chang-Yun
Lin Yen-Chih
Wallick E. I.
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