You searched for: “extraterrestrial radiations
extraterrestrial radiation (s) (noun), extraterrestrial radiations (pl)
The ideal amount of global horizontal radiation that a location on Earth would receive if there were no intervening atmosphere or clouds; used as the reference amount to which actual solar energy measurements are compared: Extraterrestrial radiation, known as “top-of-atmosphere” (TOA) and abbreviated as ETR, is global radiation and is the sum of diffuse and direct radiation.