This solar reconstruction uses a combination of 14C and “archeomagnetic field models” (Licht) to show strong solar activity modality.
Fig 3 from paper
Evidence for distinct modes of solar activity
I. G. Usoskin, G. Hulot, Y. Gallet, R. Roth, A. Licht, F. Joos, G. A. Kovaltsov, E. Thébault and A. Khokhlov
A&A 562 L10 (2014)
Conclusions. The Sun is shown to operate in distinct modes – a main general mode, a Grand minimum mode corresponding to an inactive Sun, and a possible Grand maximum mode corresponding to an unusually active Sun. These results provide important constraints for both dynamo models of Sun-like stars and investigations of possible solar influence on Earth’s climate.
Posted by Tim