[pa_dweller]

I read a book (can't remember the name) that posits that lower sun activity lessens the protective power of Earth's magnetic shield allowing more cosmic rays into the atmosphere, thus inducing cloud nucleation and hence greater cloudiness which cools the Earth.

There's so much we don't know.

[Reily]

This book

https://www.amazon.com/Chilling-Stars-Cosmic-Climate-Change/dp/1840468661/ref=sr_1_1?ie=UTF8&qid=1514241963&sr=8-1&keywords=the+chilling+stars

?

[Ozark Tom]

The solar wind is much more energetic with sunspot activity. The solar plasma then inflates a magnetic bubble originating from the sun’s field to a greater extent. This inflation mechanism allows deflecting a greater amount of cosmic ray originating outside the solar system.

A lower amount of cosmic ray reaching Earth’s atmosphere results in less clouds at altitude to reflect sunlight back to space. More sunlight heats the Earth’s surface.

Low solar activity reverses the process, thus allowing more cosmic ray activity, more production of clouds, and less sunlight to heat the Earth.

https://wattsupwiththat.com/reference-pages/solar/