Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rac..conf..113s&link_type=abstract
RELATIVISTIC ASTROPHYSICS AND COSMOLOGY. Proceedings of the 13th Course of the International School of Cosmic Ray Astrophysics.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We study the problem of cosmic ray diffusion in the Milky Way while considering the galactic spiral arm dynamics. Once this new ingredient is added to cosmic ray diffusion models, we find that the cosmic ray flux reaching the solar system should increase periodically with each passage of a spiral arm. We continue with studying the meteoritic exposure ages and find that a record of past crossings of the arms can be extracted. We then briefly review recent evidence which links cosmic rays to climatic change on Earth. Given the suspected link, we argue that spiral arm passages are responsible for the periodic appearance of ice age epochs on Earth. This hypothesis is supported with a clear correlation between ice age epochs and the meteoritic record and also between longer term activity in the Milky Way and glacial activity on Earth. More speculatively, the last such passage may have been partially responsible for the demise of the dinosaurs.
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