About the RMI
The UV-measurements of the RMI
The sunlight consists out of visible and invisible radiation of different wavelengths. A bigger part of that radiation is blocked by the atmosphere. Only visible light and a part of ultraviolet (UV) and infrared (IR) radiation reach the earth’s surface. Ultraviolet radiation is highly energetic with wavelengths between 200 and 400 nm.
Since 1990 RMI measures the intensity of UV-radiation in Uccle on the earth’s surface with a Brewer spectrophotometer. The UV-index for Uccle is calculated on the basis of these measurements. More information about the Brewer spectrophotometer you find here.
The figure below shows the long-term series of the UV index measured with the Brewer spectrophotometer in Uccle between 1990 and 2018.