Bright aurora made birds sing in night

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 An international team of scientists has discovered a huge spike in radiocarbon levels 14,300 years ago by analyzing ancient tree-rings found in the French Alps. 

The radiocarbon spike was caused by a massive solar storm, the biggest ever identified. 

The largest, directly-observed, solar storm occurred in 1859 and is known as the Carrington Event. 

It caused massive disruption on Earth - destroying telegraph machines and creating a night-time aurora so bright that birds began to sing, believing the sun had begun to rise. 

Nine such extreme solar storms -- known as Miyake Events -- have now been identified as having occurred over the last 15,000 years. 

The most recent confirmed Miyake Events occurred in 993 AD and 774 AD.

This newly-identified 14,300-year-old storm is, however, the largest that has ever been found roughly twice the size of these two. 

However, the Miyake Events (including the newly discovered 14,300-yr-old storm) would have been a staggering entire order-of-magnitude greater in size. 

In the study, researchers from the UK, France and Czech Republic measured radiocarbon levels in ancient trees preserved within the eroded banks of the Drouzet River, near Gap, in the Southern French Alps. 

The tree trunks, which are sub-fossils-- remains whose fossilisation process is not complete -- were sliced into tiny single tree-rings.



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