Can someone explain Auroras?

Regarding the Auroras seen at/near the polar regions on earth.
I understand that Auroras are caused by solar winds being deflected into the polar regions due to earths magnetic field and interacting with the atmospher producing energy in the form of the lights.
But it’s also the earths magnetosphere that protects us from the suns radiation.
Does that mean there is more exposure to the suns radiation around the polar regions as these polar winds get drawn there, interacting with the atmosphere and producing light (Auroras)?
What about the ice in those regions?
Wouldn’t more solar radiation mean more energy in the form of heat?
Or is something preventing the solar energy from turning into heat energy, and just staying at the light energy phase?
Thank you.