Free Republic

Archaeologists have dated the lakefront Neolithic (7000–3200 b.c.) settlement of Dispilio in northern Greece using a method that involves detecting evidence of bursts of cosmic radiation in ancient wood samples. In 2012, physicist Fusa Miyake first identified sudden spikes in the level of radioactive carbon-14 in tree rings that could be attributed to bombardment by cosmic rays at precisely known points in the past. A handful of these spikes, called Miyake Events, which allow wood samples to be dated to a single year, can be identified in tree rings dating back as far as 12,350 b.c.A team including University of...

Named Miyake events after the lead author of the first study to describe them, the spikes occur roughly once every 1,000 years or so and are recorded as sudden increases in the radiocarbon levels of ancient tree rings. The leading theory among scientists is that Miyake events are solar flares that are 80 times more powerful than the strongest flare ever recorded. But a new study...suggests that the origin of the radiation bursts could be even more mysterious than first thought. Scientists have spotted six Miyake events in tree rings so far, indicated by sudden, single-year leaps in the concentrations...