Why do your charts have wonky scales? The top one has no Temp scale at all, while the bottom one has +20 at the bottom and -20 at the top.
Junk science abounds.
If you look closely (I had to, too) the y-axis of the lower graph is C-14 fraction in permille (1/1000) - not temperature.
They use C-14 tracking to determine historic sun activity.
The top chart is just basic, probably had more info at the site it was taken from.
The bottom chart is solar output not temperature. Since the info was taken from carbon14 readings the C probably refers to carbon radioactivity measurements. I assume that from the word ‘permille’ in paranthesis next to the C.
If you doubt the accuracy of either chart I recommend you find better ones and post them for all to see.