Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3753m&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
4
Scientific paper
The temporal variations of the cosmogenic isotope 10 Be for the period 1500-2000AD are used to investigate the nature of the cosmic ray modulation process, and the properties of the cosmic ray spectrum outside the heliosphere. It is shown that the cosmic radiation observed at earth has been subjected to a long term modulation mechanism with a relaxation time ≥ 200 years, in addition to the 11 year modulation. It is proposed that this modulation occurs within the heliosheath. The 200 year modulation has depressed the spectrum at ˜2GeV by >50% since 1695; making it 2.5-3 times greater than the 11 year modulation events observed since 1954. The 10 Be data in the vicinity of 1695 are too high to be explained by the force field modulation function, and there is a speculative argument that the 10 Be concentration could be a further 63% higher in the total absence of modulation. In view of its large amplitude, however, use of the Gleeson and Axford modulation function in its description is likely to result in substantial errors. It is proposed that the high values of 10 Be in 1695 should be used as a constraining measurement, together with the energy and isotopic spectra observed near earth, in the determination of the properties of the local interstellar cosmic ray spectrum.
McCracken Ken
McDonald Frank
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