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We construct a Galactic cosmic ray (CR) diffusion model while consideringthat CR sources reside predominantly in the Galactic spiral arms. We find thatthe CR flux (CRF) reaching the solar system should periodically increase eachcrossing of a Galactic spiral arm. We search for this signal in the CR exposureage record of Iron meteorites and confirm this prediction. We then check thehypothesis that climate, and in particular the temperature, is affected by theCRF to the extent that glaciations can be induced or completely hindered bypossible climatic variations. We find that although the geological evidence forthe occurrence of IAEs in the past Eon is not unequivocal, it appears to have anontrivial correlation with the spiral arm crossings--agreeing in period andphase. Thus, a better timing study of glaciations could either confirm thisresult as an explanation to the occurrence of IAEs or refute a CRF climaticconnection.Comment: 4 Journal pages, 2 figures, revtex4. Appearing today in Phys Rev Let

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