UV radiation

UV radiation (aka ultraviolet radiation) is a form of radiation, usually emitted by stars.

Protection from UV radiation comes from atmospheric protection, in terms of an ozone layer. Planet such as P3X-513 are greatly effected from UV radiation due to minimal atmospheric protection, this creates hazardous conditions for outdoor travelling and minimal life. Two Ancient force field devices can create a force field that blocks UV radiation much like an ozone layer. (SG1: "The First Commandment")