A cosmic storm in A.D. 993 released a pulse of radiation so powerful that it was recorded in the rings of the world’s trees. That solar event helps pinpoint the year the Vikings were present in the Americas
In A.D. 993, a storm on the sun released an enormous pulse of radiation that was absorbed and stored by trees all over the Earth. Now, that solar event has proved a critical tool in pinpointing an exact year the Vikings were present in the Americas.in Canada's Newfoundland more than 50 years ago, most scholars accept that Viking sailors, who explored the seas beginning in the late 700s to around 1100, were the first Europeans to reach the Americas.
A microscope image of a wood fragment from L’Anse aux Meadows. Researchers carbon dated individual tree rings to identify the one that formed during the cosmic storm of A,D. 993.'Like a gold mine' , a co-author of the study, visited the warehouse a few years ago, she was stunned. Millennia-old wood “looked perfectly fresh, like it was put in yesterday,” she says. “It was like a gold mine.”, a radiocarbon dating expert also at the University of Groningen, were searching for sites to test a new dating method based on tree rings.
The cosmic storm, along with a similar event in 775, left behind “spikes” that skew radiocarbon dates from wood by about a century, a fact that researchers first identified in 2012. Identifiable only by comparing radiocarbon dates from individual tree rings, the resulting anomaly creates a sort of tree ring time stamp. “When you hit the spikes it’s really clear,” says Dee, who led the new study.
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