Moon phases and lunar diet

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

UV index (UV index) of the Sun today

Ultraviolet radiation is part of the electromagnetic spectrum of solar radiation.

Graph of the function of the erythemal UV index

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

World erythemal UV index today

UV index in Europe today

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 the sun, and increase the number of people exposed to artificial radiation emitted from various industrial, commercial or cosmetic sources.

Area of UV radiation covers waves in length from 100 to 400 nm, divided into three frequency bands:

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

In entering into the atmosphere, much of the UV radiation is absorbed. The whole UVC and approximately 90% of UVB radiation to assume from ozone, water vapor, oxygen and carbon dioxide. Passage of UVA radiation is affected much less by the atmosphere, therefore reaching the ground UV radiation is made up of UVA and very few UVB rays.

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

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