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Pastimes : IT CAME FROM OUTER SPACE

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To: kinkblot who wrote (255)	6/27/2006 10:08:01 AM
From: kinkblot	Read Replies (1) of 480

Celestial driver of Phanerozoic climate? Paper by Shaviv and Veizer on cosmic ray flux & climate. gsajournals.org We also find an average spiral arm passage period of P0 = 137 ± 4 m.y., or 137 ± 7 m.y. if we consider the "jitter" from the epicyclic motion of the solar system (i.e., the noncircular motion around the Milky Way). Shaviv and Veizer give a "robust physical formulation" to the link between solar activity, cosmic ray flux and climate. They show using geological data going back a half billion years that galactic cosmic ray flux has correlated inversely with global temperature in cycles having approximately the same period as above. See Figure 2. The solar wind acts to deflect galactic cosmic rays, so variation of the solar wind contributes to shorter-term climate cycles. The effect of increasing solar wind on temperature is a double negative, i.e. a positive effect. Solar wind tends to wax and wane synchronously with solar flux; therefore the two short-term factors act in the same direction. science.uottawa.ca - Jan Viezer

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