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Hi Daniel,

I had no involvement in the paper, though I did read an early draft of it.

The consensus for the origin of these radiocarbon excess events is one (or more) Solar Proton Events. See for example Usoskin et al. (2013). It had been conjectured that a close gamma ray burst or supernova may have been the cause, but such events do not appear to have the correct radiation spectrum to generate the measured isotopic anomalies in 14C, 10Be and 36Cl (see Mikhaldi, 2014 for example).

Jonny

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Subject Views Written By Posted
Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 1517 JonnyMcA 07-Sep-18 13:15
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 212 D-Archer 07-Sep-18 13:59
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 279 JonnyMcA 07-Sep-18 14:12
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 222 Aine 08-Sep-18 01:02
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 279 JonnyMcA 08-Sep-18 10:41
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 220 Aine 08-Sep-18 11:41
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 283 JonnyMcA 09-Sep-18 09:38
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 230 ianw16 08-Sep-18 10:44
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 212 Archaic 08-Sep-18 21:36
Re: Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE 383 JonnyMcA 09-Sep-18 09:54


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