Direct radiation

Sunlight that hits the earth's surface directly is called direct radiation. In contrast to diffuse radiation, the light hits the earth's surface without any obstacles, e.g. clouds, etc. Direct radiation can therefore be defined as any radiation that hits an object by the shortest route, from which it is then partially transmitted as diffuse radiation. PV plants absorb parts of the solar energy and convert it into electrical energy. However, large parts are also reflected and scattered as diffuse radiation. Together with the diffuse radiation, the direct radiation forms the global radiation.