We have noted that the sun plays a role in climate and weather in many ways. When the sun is more active near solar maxima, the sun is slightly brighter and irradiance increases - 0.1% on most recent cycles, more in cycle 23.
There is also up to 10% more UV radiation which produces ozone chemistry related warming in low and middle latitudes high up in the atmosphere that works itys way down to the mid-troposhpere as shown in data by Karin Labitzke in numerous papers in recent decades and in models by Hansen's star climate modeller, Drew Shindell. Geomagnetic storms can affect high latitude patterns and blocking.
Diffusion of galactal cosmic rays which play a role in low water cloudiness through ion mediated nucleation can produce less low cloudiness (the Svensmark effect).
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