The AD775 cosmic event revisited: the Sun is to blame

Usoskin IG, Kromer B, Ludlow F, Beer J, Friedrich M, Kovaltsov GA, Solanki SK & Wacker L
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Usoskin, I. G., Kromer, B., Ludlow, F., Beer, J., Friedrich, M., Kovaltsov, G. A., Solanki, S. K., & Wacker, L. (2013). The AD775 cosmic event revisited: the Sun is to blame. Astronomy and Astrophysics, 552, L3 (4 pp.). https://doi.org/10.1051/0004-6361/201321080