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