Diffuse radiation

Sunlight that hits the earth's surface does so either directly or indirectly. Indirect solar radiation is called diffuse or scattered radiation. The term "diffuse" means that the light arrives irregularly scattered and without a uniform direction. This is the case, for example, when sunlight penetrates through clouds or changes its direction and/or intensity due to other particles in the air. These particles can be, for example, dust grains, sand or even soot particles. Water - whether in the form of rain or bodies of water - can also be a diffuser. Together with direct radiation, diffuse radiation forms global radiation.