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Details

Autor(en) / Beteiligte
Titel
Multiradionuclide evidence for the solar origin of the cosmic-ray events of a'[euro]a'... 774/5 and 993/4
Ist Teil von
  • Nature communications, 2015-10, Vol.6, p.8611
Ort / Verlag
London: Nature Publishing Group
Erscheinungsjahr
2015
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • The origin of two large peaks in the atmospheric radiocarbon (14 C) concentration at AD 774/5 and 993/4 is still debated. There is consensus, however, that these features can only be explained by an increase in the atmospheric 14 C production rate due to an extraterrestrial event. Here we provide evidence that these peaks were most likely produced by extreme solar events, based on several new annually resolved 10 Be measurements from both Arctic and Antarctic ice cores. Using ice core 36 Cl data in pair with 10 Be, we further show that these solar events were characterized by a very hard energy spectrum with high fluxes of solar protons with energy above 100 MeV. These results imply that the larger of the two events (AD 774/5) was at least five times stronger than any instrumentally recorded solar event. Our findings highlight the importance of studying the possibility of severe solar energetic particle events.
Sprache
Englisch
Identifikatoren
eISSN: 2041-1723
DOI: 10.1038/ncomms9611
Titel-ID: cdi_proquest_journals_1726800181
Format

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