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The Milky Way Galaxy's Spiral Arms and Ice-Age Epochs and the Cosmic Ray Connection
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Science Bits

March 30,2006

By Nir J. Shaviv

EXCERPT:

1. Ice Age Epochs and Milky Way Spiral Arm Passages:

Different empirical evidence convincingly support the existence of a link between solar activity and the terrestrial climate. In particular, various climate indices appear to correlate with solar activity proxies on time scales ranging from years to many millennia. For example, small but statistically significant temperature variations (of about 0.1°C) exist in the global temperature, following the 11 year solar cycle. On longer time scales, the climate system has enough time to adjust, and larger temperature variations arise from the secular variations in the solar activity.

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