Moon phases and lunar diet

Lunar phases, moon diet, lunar calendar, info about the moon and the celestial bodies, astronomy and astrology.

UVindex (ultraviolet index) maps of the Sun today

UVindex (ultraviolet index) maps of the Sun today

Latest uvindex maps of the Sun. Ultraviolet radiation in Europe and around the world.

Map of the orld erythemal UVindex

World erythemal UV index today

Map of the UVindex in Europe today

UV index in Europe today

Erythemal UV index as a function of the total ozone in (atmospheric) column (TOC) and the solar zenith angle, according to the parameters Allaart. Dotted lines represent values of the erythemal UVindex 20, 19, . . . , 2, 1, 0.5, and continuous lines are for the values 20, 11 and 2.

Graph of the function of the erythemal UVindex The function of the erythemal UVindex

Ultraviolet (UV) radiation is part of the electromagnetic spectrum emitted by the sun. Sun rays include visible light, heat and UV radiation.

Everyone is exposed to UV radiation from our Sun, and the number of people exposed to artificial radiation emitted from various industrial, commercial or cosmetic sources, increases every year.

The UV region covers the wavelength range 100-400 nm and is divided into three bands:

  • UVA (315-400 nm)
  • UVB (280-315 nm)
  • UVC (100-280 nm)

As sunlight passes through the atmosphere, all UVC and approximately 90% of UVB radiation is absorbed by ozone, water vapour, oxygen and carbon dioxide. UVA radiation is less affected by the atmosphere. Therefore, the UV radiation reaching the Earth’s surface is largely composed of UVA with a small UVB component.

UVA and UVB are of great importance for the health of human. Small amounts of UV are essential for the production of vitamin D in the body of people, yet overexposure to UV radiation may result in acute and chronic health effects on the skin, eye and immune system.

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Source:
UV radiation monitoring @ TEMIS и Ultraviolet radiation @ WHO.