Computer Science
Scientific paper
Oct 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1691f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 10, pp.1691-1700
Computer Science
Scientific paper
The Na 22 :Al 26 ratio in six recently fallen meteorites, including P íbram, and the Ar 37 : Ar 39 ratio in three recently fallen meteorites were measured. The Na 22 :Al 26 and Ar 37 : Ar 39 ratios are indicators of variations in the cosmic-ray bombardment of meteorites. The Na 22 :Al 26 ratios, which are produced by cosmic rays integrated over the meteoroid orbit, show that the 11-yr cosmic-ray variation is smaller at the average solar distance of most meteoroids than at 1 a.u. The Ar 37 : Ar 39 ratios, which compare cosmic rays in the neighborhood of 1 a.u. with those at the average solar distance of the meteoroid, give a high-energy cosmic-ray heliocentric radial gradient of 20 ± 8 per cent/a.u. at solar maximum and at solar minimum.
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