Miyake event

Sharp increase in cosmogenic isotopes

A Miyake event is an observed sharp enhancement of the production of cosmogenic isotopes by cosmic rays. It can be marked by a spike in the concentration of radioactive carbon isotope 14C in tree rings, as well as 10Be and 36Cl in ice cores, which are all independently dated. At present, five significant events are known for which the spike in 14C is quite remarkable, i.e. above 1% rise over a period of 2 years, and four more events need independent confirmation. It is not known how often Miyake events occur, but from the available data it is estimated to be every 400–2400 years.

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