Interesting but was it from our sun, and/or was our sun "triggered". This was based on tree-ring data in Japan and North America, but I wonder about South America. If there was a substantial variation between North and South it could tell us something - although there are weather mechanisms for mixing radiocarbon between hemispheres.
Mauro Lacy may know this, since he follows the subject area. If the 14Carbon increase were higher in the Southern Hemisphere, for instance, then my bet for the culprit is an x-ray burst from eta Carinae. It is the "death star" that produces massive directed cosmic rays at times - and we do not know how far back its instability began. http://www.mail-archive.com/vortex-l@eskimo.com/msg63181.html If the rate of 14C in tree rings were found to be less in the Southern Hemisphere, it would probably rule out this particular source, which at various times has been the brightest star in the night-time sky (Sirius is normally brighter but it is only 8+ light years away while eta Carinae, even at its enormous distance of 8,000 ly - has been as bright as Sirius at times. -----Original Message----- From: Terry Blanton http://www.nature.com/news/mysterious-radiation-burst-recorded-in-tree-rings -1.10768 "Just over 1,200 years ago, the planet was hit by an extremely intense burst of high-energy radiation of unknown cause, scientists studying tree-ring data have found." http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11123.html Is it possible that our sun generated an unprecedented energy burst? T
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