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We have compared the yearly production rates of 10Be by cosmic rays in theEarths polar atmosphere over the last 50-70 years with 10Be measurements fromtwo separate ice cores in Greenland. These ice cores provide measurements ofthe annual 10Be concentration and 10Be flux levels during this time. Thescatter in the ice core yearly data vs. the production data is larger than theaverage solar 11 year production variations that are being measured. The crosscorrelation coefficients between the yearly 10Be production and the ice core10Be measurements for this time period are <0.4 in all comparisons between icecore data and 10Be production, including 10Be concentrations, 10Be fluxes andin comparing the two separate ice core measurements. In fact, the crosscorrelation between the two ice core measurements, which should be measuringthe same source, is the lowest of all, only ~0.2. These values for thecorrelation coefficient are all indicative of a "poor" correlation. Theregression line slopes for the best fit lines between the 10Be production andthe 10Be measurements used in the cross correlation analysis are all in therange 0.4-0.6. This is a particular problem for historical projections of solaractivity based on ice core measurements which assume a 1:1 correspondence. Wehave made other tests of the correspondence between the 10Be predictions andthe ice core measurements which lead to the same conclusion, namely that otherinfluences on the ice core measurements, as large as or larger than theproduction changes themselves, are occurring. These influences could beclimatic or instrumentally based. We suggest new ice core measurements thatmight help in defining more clearly what these influences are and-ifpossible-to correct for them.

geochimica et cosmochimica acta

A Comparison Of New Calculations Of The Yearly 10Be Production In The  Earths Polar Atmosphere By Cosmic Rays With Yearly 10Be Measurements In  Multiple Greenland Ice Cores Between 1939 And 1994 - A Troubling Lack Of  Concordance Paper #2