How does solar radiation function?
The sun emits infinite light rays of various wavelengths, from the shortest to the longest. It also emits cosmic rays, gamma rays, X rays, ultraviolet (UV) rays (including UVC, UVB and UVA rays), visible radiation, infrared radiation (IR) and radio waves.
The most dangerous part of a solar ray is filtered by the atmosphere. Two-thirds of this ray reach the earth. Cosmic rays, gamma rays, X rays and UVC rays, incompatible with life, do not reach its surface. The rays that make their way to us (UVB, UVA, visible and infrared rays) influence the body. Infrared rays give off heat; these rays make skin feel hot, as opposed to UVB and UVA rays that are invisible and cold but still have a large biological effect.