Mysterious radiation burst recorded in tree rings (774–775 AD)
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.
