[meteorite-list] Mysterious radiation burst recorded in tree rings (774–775 AD)

[Paul H.]

Cosmic rays showered Earth 1230 years ago, but 
where from? Los Angeles Times, June 4, 2012
http://www.latimes.com/news/science/sciencenow/la-sci-sn-cosmic-ray-increase-20120604,0,6401794.story?track=rss

Mysterious radiation burst recorded in tree rings
(Spike in carbon-14 levels indicates a massive 
cosmic event — but supernovae and solar flares 
ruled out.) by Richard A. Lovett, June 2, 2012
http://www.nature.com/news/mysterious-radiation-burst-recorded-in-tree-rings-1.10768

The paper is:

Miyake, F., K. Nagaya, K. Masuda, and T. 
Nakamura, 2012, A signature of cosmic-ray 
increase in ad 774–775 from tree rings in 
Japan. Nature. Published online June 3, 2012.
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11123.html

Best wishes,

Paul H.