Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (∼660 BC).

ABSTRACT: Recently, it has been confirmed that extreme solar proton events can lead to significantly increased atmospheric production rates of cosmogenic radionuclides. Evidence of such events is recorded in annually resolved natural archives, such as tree rings [carbon-14 (¹⁴C)] and ice cores [beryllium-10 (¹⁰Be), chlorine-36 (³⁶Cl)]. Here, we show evidence for an extreme solar event around 2,610 years B.P. (∼660 BC) based on high-resolution ¹⁰Be data from two Greenland ice cores. Our conclusions are supported by modeled ¹⁴C production rates for the same period. Using existing ³⁶Cl ice core data in conjunction with ¹⁰Be, we further show that this solar event was characterized by a very hard energy spectrum. These results i

SUBMITTER: O'Hare P 

PROVIDER: S-EPMC6442557 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature