# MeteonormFaq

## Definition of direct and diffuse radiation

Description of direct and diffuse parts of global radiation

Shortwave radiation (0.2 - 3.0μm) arising from a narrow solid angle (5° aperture) centered around the sun's disk impinging on a horizontal surface.

### Direct normal radiation (beam, Bn, DNI)

Shortwave radiation (0.2 - 3.0μm) arising from a narrow solid angle (5° aperture) centered around the sun's disk and impinging on a surface normal to the direction of the radiation.