Solar radiation warms the surface of the planet and then is radiated back in the form of

The answer is Infrared Light.  Solar radiation is radiant emitted energy by the sun from the fusion nuclear reaction that makes electromagnetic energy. The solar radiation heats the surface of the earth, it also drives the weather. Infrared light is like exposing yourself into a hot stove the radiation is very dangerous like if your eyes, is exposed to an infrared light it is much dangerous in your eye.

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.