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Solar Radiation is radiant energy emitted by the sun, particularly electromagnetic energy. The spectrum of solar radiation is close to that of a black body of the temperature T~5800 K. About half of the radiation is in the visible short-wave part of the electromagnetic spectrum. The other half is mostly in the near-infrared part, with some in the ultraviolet part of the spectrum [1]. The ultraviolet radiation not absorbed by the atmosphere or other protective coating is responsible for the change of color in skin pigments. Solar radiation is measured at this station and recorded as Watts per Square Meter (W/m²).

Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. It can be subdivided into near UV (400–200 nm wavelength; abbrev. NUV), far or vacuum UV (200–10 nm; abbrev. FUV or VUV), and extreme or deep UV (1–31 nm; abbrev. EUV or XUV).

Evapotranspiration (ET) is the sum of evaporation and plant transpiration. Evaporation accounts for the movement of water to the air from sources such as the soil, canopy interception, and waterbodies. Transpiration accounts for the movement of water within a plant and the subsequent loss of water as vapour through stomata in its leaves. Evapotranspiration is an important part of the water cycle.