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EP: Fachverband Extraterrestrische Physik

EP 11: Sonne und Heliosphäre III

EP 11.4: Talk

Friday, March 1, 2013, 12:15–12:30, HS 9

The AD 774/5 cosmic-ray event - from the Sun or a short Gamma-Ray Burst ? — •Ralph Neuhaeuser and Valeri Hambaryan — AIU, Univ. Jena, Schillergaeeschen 2, Jena

In the year AD 774/5, there was a strong short peak in 14C seen in tree rings and ices cores (Miyake et al. 2012). The energy input was 7e24 erg within up to one year. The cause remained unknown (Miyake et al. 2012), neither historic supernovae nor young nearby supernova remnants or pulsars are known for this age or year. We have shown that a short Gamma-Ray Burst in our Galaxy is consistent with all observables, including the production rate of both 14C and 10Be (Hambaryan & Neuhaeuser in press). More recently, it was also suggested by others that this event could have been due to either an impact of a comet onto the Sun or the very large solar flare of proton event. We will compare those possibilities in particular regarding the event rates and the differential production rate of 14C and 10Be. We can also speculate on possible effects of such an event on the Earth biosphere.