What does far UV mean?
Definition of far-ultraviolet : of, relating to, or being the shortest wavelengths of radiation in the ultraviolet spectrum and especially those between 100 and 300 nanometers.
Where is UV radiation the highest?
The highest UVI of 25 was in the grid cell centred on Cuzco, in southern Peru (13.5° S, 3360 m a.s.l.). Peak values on the edge of the Antarctic Plateau also exceed the highest UVI in New Zealand, and are comparable to those at sea level in the tropics.
What is the difference between near and far UV?
The near UV region lies closest to visible light, and includes wavelengths between 200 and 400 nm. The higher energy, shorter wavelength far UV region spans wavelengths between 91 and 200 nm.
What is far UV region?
The middle-UV region ranges from 300 to 200 nm, and shorter wavelengths from 200 nm down to 10 nm belong to the far-UV region.
Which type of UV radiation penetrates skin the farthest?
UVA
Longer wavelength UVA penetrates deeply into the dermis reaching well into the dermis. In contrast, UVB is almost completely absorbed by the epidermis, with comparatively little reaching the dermis.
Why is the sun so harsh in Australia?
Australia’s unusually harsh sunshine results mainly from its location in the Southern Hemisphere. The elliptical orbit of the Earth places the Southern Hemisphere closer to the sun during its summer months than the Northern Hemisphere during its summer.
Is UVB or UVA more harmful?
UVA rays, while slightly less intense than UVB, penetrate your skin more deeply. Exposure causes genetic damage to cells on the innermost part of your top layer of skin, where most skin cancers occur. The skin tries to prevent further damage by darkening, resulting in a tan.
How much sun a day is OK?
Regular sun exposure is the most natural way to get enough vitamin D. To maintain healthy blood levels, aim to get 10–30 minutes of midday sunlight, several times per week. People with darker skin may need a little more than this.