Hi,

I assume you are asking about the large solar flares we have been having lately. Solar flares don't affect the amount of light that gets down to the surface significantly, even in the IR (infrared) and UV (ultraviolet). The light that makes it down to the atmosphere is mostly from the regular output of the sun's surface, which is very bright, and even large flares are a relatively small blip on top of that - although we can observe flares from the ground, so there is some light that reaches the surface (they can be seen light in the H-alpha spectral line for instance. This is commonly observed by amateur astronomers, so you may know about that). Flares also put out a lot of radio waves that we can observe from Earth's surface.

Above Earth's atmosphere in space things are a little different. Flares make a big difference if you are observing in high energy ultraviolet ("Extreme UV") or in X-rays. However, these bands of light are well blocked by Earth's atmosphere - a good thing!

Terry