Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE
oleh: Nicolas Brehm, Marcus Christl, Timothy D. J. Knowles, Emmanuelle Casanova, Richard P. Evershed, Florian Adolphi, Raimund Muscheler, Hans-Arno Synal, Florian Mekhaldi, Chiara I. Paleari, Hanns-Hubert Leuschner, Alex Bayliss, Kurt Nicolussi, Thomas Pichler, Christian Schlüchter, Charlotte L. Pearson, Matthew W. Salzer, Patrick Fonti, Daniel Nievergelt, Rashit Hantemirov, David M. Brown, Ilya Usoskin, Lukas Wacker
| Format: | Article |
|---|---|
| Diterbitkan: | Nature Portfolio 2022-03-01 |
Deskripsi
Two extreme solar energetic particle events have been found by carbon isotopes measured in ancient tree rings in 7176 and 5259 BCE. The recorded ~2% increases of atmospheric 14 C for both events exceeds in amplitude of all previously observed events.