Something similar happens to Earth's atmosphere every 11 years when the sunspot cycle nears maximum. As solar activity increases, extreme ultraviolet radiation (EUV) heats our planet's gaseous envelope, causing it to swell and reach farther into space than normal. While puffed-up marshmallows can lead to tooth decay, our puffed-up atmosphere vexes satellite operators with a different kind of problem -- orbit decay.
Many researchers believe the steady rise in sunspots and faculae since the late seventeenth century may be responsible for as much as half of the 0.6 degrees of global warming over the last 110 years (IPCC, 2001).
Another trend scientists have picked up on appears to span several centuries. Late 17th century astronomers observed that no sunspots existed on the Suns surface during the time period from 1650 to 1715 AD. This lack of solar activity, which some scientists attribute to a low point in a multiple-century-long cycle, may have been partly responsible for the Little Ice Age in Europe. During this period, winters in Europe were much longer and colder than they are today. Modern scientists believe that since this minimum in solar energy output, there has been a slow increase in the overall sunspots and solar energy throughout each subsequent 11-year cycle.
Does this constitute evidence in your book?
Yes. Refer to the first link in point #2 of my profile.