In a guess post at Watts Up With That on the cooling signals embedded in the Aurora Borealis, Dr Tim Ball concludes:
The current debate attracting more and more people is that we are cooling with the only question left as to the extent and intensity. Will it be [the] weather similar to the cooler period coincident with the Dalton Minimum from 1790 – 1830? Alternatively, will it be colder with similar conditions to those by the early fur traders in Hudson Bay or those that spanned the life of Sir Edmund Halley? The appearance of Aurora in northern England suggests the latter, although I can predict who will protest this suggestion.
This is an interesting analysis of historical documents. Read the full story HERE.
In the comments Leif Svalgaard offered this:
The sun sends us several ‘messages’ about its activity. One [beautiful] one is the aurora which has been observed since antiquity. I recently gave a seminar on those messengers:
https://leif.org/research/Multi-Messenger-Solar-Physics-Through-Time.pdf
The aurorae evidence is very difficult to calibrate. I have not studied Svalgaard’s paper yet but its looks very interesting.
Looking forward to your comments on the questions: Is the auroral evidence of the next grand minimum and a little ice age?
The Next Grand Minimum 
Sunspot cycles mat be calculated. There are two cycles: an 11,49-year fundamental cycle and an 187-year long cycle. These two mix together to produce an 18,139-year cycle. The magnetic field of Mercury is the prime mover in the sunspot cycle. When Mercury’s magnetic field decays the sunspot cycle stops. see http://www.MauriceCotterell.com ‘The cuase of global warming and global cooling’.