On the cosmogenic radionuclides in meteorites.

Details On the cosmogenic radionuclides in meteorites. On the cosmogenic radionuclides in meteorites.

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ncimc..18..411b&link_type=abstract

Nuovo Cimento C, Vol. 18C, N. 4, p. 411 - 418

Physics

Meteorites: Cosmic Rays, Cosmic Rays: Solar Modulation

Scientific paper

Different fluxes and spectra of galactic cosmic rays (GCR) and solar cosmic rays result in a wide variety of radioactive and stable-nuclides production rates. The records of cosmic-ray interactions have been studied in terrestrial archives, in meteorites, cosmic dust and lunar samples. The present authors give some results obtained on the study of cosmogenic radionuclides produced in meteorites which fell in the last century. The solar modulation affects the intensity of GCR and therefore the isotope production rates in meteorites. The 11 yr solar cycle is well reproduced by the variations of 22Na (T1/2 = 2.6 y) in meteorites which fell during the past three solar cycles. The 44Ti (T1/2 = 66.6 y) activity measured in eight chondrites which fell in the last 110 y is qualitatively consistent with the century-scale solar-activity variation, called the Gleissberg cycle. The increase is roughly four times higher than expected (about 5%) for a GCR flux calculated by a model in which the solar-activity modulation is determined solely by the sunspot number index R. This result suggests a much weakened modulation of GCR during the prolonged Gleissberg minimum during which highly ordered magnetic fields set up in the heliosphere.

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