Cosmic Ray Diffusion from the Galactic Spiral Arms, Iron Meteorites, and a Possible Climatic Connection

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Abstract

We construct a Galactic cosmic ray (CR) diffusion model. The CR flux reaching the Solar System should periodically increase with each crossing of a Galactic spiral arm. We confirm this prediction in the CR exposure age record of iron meteorites. We also find that although the geological evidence for the occurrence of ice-age epochs in the past eon is not unequivocal, it appears to have a nontrivial correlation with the spiral arm crossings and the CR flux variability—agreeing in period and phase.

Original languageAmerican English
JournalPhysical Review Letters
Volume89
Issue number5
DOIs
StatePublished - 2002
Externally publishedYes

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