Impact Origin of 775 AD Radiocarbon Spike (Anomaly) Disputed
Usoskin, I. G., and G. A. Kovaltsov, 2015, The carbon-14
spike in the 8th century was not caused by a cometary
impact on Earth. Icarus. vol. 260, pp. 475–476
PDF file at http://cc.oulu.fi/~usoskin/personal/Icarus_2015.pdf
and preprint at http://arxiv.org/abs/1401.5945 .
More Papers In List of publications: Ilya G. Usoskin at
For background information about the 775 AD
Radiocarbon Spike, look at:
774–775 carbon-14 spike
Jull, A. J. T., I. P. Panyushkina, T. E. Lange, V. V. Kukarskih,
V. S. Myglan, K. J. Clark, M. W. Salzer, G. S. Burr, and S. W.
Leavitt, 2014, Excursions in the 14C record at A.D. 774–775
in tree rings from Russia and America. Geophysical Research
Letters. vol. 41, no. 8, pp. 3004-3010.
PDF file at
Neuhauser, R., and D. L. Neuhauser, 2011, Variations of
14C around AD 775 and AD 1795 – due to solar activity.
Astronomische Nachrichten / AN 999, no. 88, 789 – 813.
PDF at http://arxiv.org/pdf/1508.06745.pdf and
This is my 9th try at posting this post. All of the previous
ones have disappeared into the ether never to seen of