More evidence for grand minimums the Maunder and Dalton.
1. Oliva et al., 2018
Cold period during 1645–1706 (Maunder solar minimum). Cold period during 1810–1838 (Dalton solar minimum). Warm period during the mid-20th and 21st centuries (modern solar maximum).
2. Ukhvatkina et al., 2018
It is well known that cold and warm periods of the climate are correlated with intensive solar activity (e.g., the Medieval Warm Period), while decreases in temperature occur during periods of low solar activity (e.g., the Little Ice Age; Lean and Rind, 1999; Bond et al., 2001).
Lockwood et al., 2018
Space climate and space weather over the past 400 years: 2. Proxy indicators of geomagnetic storm and substorm occurrence
H/T to Kenneth Richard at the No Tricks Zone.