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Karlis

Japanese scientists find 8th-century mystery

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In the late eighth century, Earth was hit by a mystery blast of cosmic rays, according to a Japanese study that found a relic of the powerful event in cedar trees. Analysis of two ancient trees found a surge in carbon-14 -- a carbon isotope that derives from cosmic radiation -- which occurred just in AD 774 and AD 775

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Possibly a gamma ray blast. Sounds likely :)

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Too early to be any sort of side effect from the crab nebula.

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A Tunguska event in that time? Woudn't that leave traces to the surrounding environment too?

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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.

The radiation burst, which seems to have hit between ad 774 and ad 775, was detected by looking at the amounts of the radioactive isotope carbon-14 in tree rings that formed during the ad 775 growing season in the Northern Hemisphere. The increase in 14C levels is so clear that the scientists, led by Fusa Miyake, a cosmic-ray physicist from Nagoya University in Japan, concludethat the atmospheric level of 14C must have jumped by 1.2% over the course of no longer than a year, about 20 times more than the normal rate of variation. Their study is published online in Nature today1.

http://www.nature.com/news/mysterious-radiation-burst-recorded-in-tree-rings-1.10768

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shouldnt they test more trees. in the article it said they tested only 2 trees.

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We need to locate the source of the gamma ray burst in our galaxy, to further vindicate the mysterious jump in temperatures in the period of the 770s AD, and too late to be analyzed in astrological terms whether or not it served the rise of Islam to become a world religion (630s AD).

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