Energetic solar particles would have flooded Earth's upper atmosphere, causing a chain of nuclear reactions and leading to a sudden spike in production of radiocarbon that would have been absorbed ...

Scientists were able to piece together the solar storm from ancient tree rings that were found in the French alps, and showed evidence of a dramatic spike in radiocarbon levels some 14,300 years ago.

Scientists were able to piece together the solar storm from ancient tree rings that were found in the French alps, and showed evidence of a dramatic spike in radiocarbon levels some 14,300 years ago.