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A rapid radiocarbon 14C increase of 120/00 in AD774–775 has been reported in cedar and oak tree rings. So far, the origin of the 14C increase is still uncertain and the possible origin is either supernova or solar particle event. The most possible origin of 14C increase is strong solar flares and Coronal Mass Ejections (CMEs) with strong particles emission. Comprehensive approaches to identify the...
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