Transcript for scene 22 of the video " The Ice Age: 6-in-1 Flank" by Rolf Witzsche - Ice Age Ahead not Global Warming  

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The isotope ratios stand as proxies for solar activity

The isotope ratios stand as proxies for solar activity, because when the Sun is strong, the Sun is surrounded by a dense sphere of plasma which absorbs a large portion of the cosmic rays emitted by the Sun. Since the carbon and beryllium isotopes are created by cosmic rays from the Sun, interacting with the atmosphere, the volume of their presence gives us a measurable value of the strength of the Sun at the specific historic time when the samples were formed.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche