| Plane orientation and radiation components |
| Radiation components over a horizontal surface: D is the Diffuse component of the radiation flow, and represents the part reflected by the atmosphere and the clouds, B is the Beam component, i.e. the part of the radiation which directly comes from the sun, G is the Global component corresponding to the sum of the two previous components. |
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| Radiation components over a horizontal surface: D: Diffuse B: Beam R: Reflected, i.e. the portion of the sun radiation reflected by the ground and visible by the tilted plane, G: Global |
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| Radiation components over a horizontal surface: D: Diffuse, B: Beam, R: Reflected, G: Global. |

