Large solar proton event explains 774–775 CE carbon-14 increase
Article first published online: 30 APR 2013
©2013. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 94, Issue 18, page 172, 30 April 2013
How to Cite
2013), Large solar proton event explains 774–775 CE carbon-14 increase, Eos Trans. AGU, 94(18), 172.(
- Issue published online: 30 APR 2013
- Article first published online: 30 APR 2013
- Cited By
- solar proton event;
Tree ring records indicate that in 774–775 CE, atmospheric carbon-14 levels increased substantially. Researchers suggest that a solar proton event may have been the cause. In solar proton events, large numbers of high-energy protons are emitted from the Sun, along with other particles. If these particles reach Earth's atmosphere, they ionize the atmosphere and induce nuclear reactions that produce higher levels of carbon-14; the particles also cause chemical reactions that result in depletion of ozone in the ozone layer, allowing harmful ultraviolet radiation to reach the ground.