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Solar UV Radiation

What is UV radiation?

Emissions from the sun include light, heat and UV radiation. The UV region covers the wavelength range 100–400 nm and is divided into three bands, UVA, UVB and UVC.
All UVC and approximately 90% of UVB radiation are 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.


UV RADIATION LEVELS ARE INFLUENCED BY:

 

SUN ELEVATION: The higher the sun in the sky, the higher the UV radiation level.
 
LATITUDE:
The closer to equatorial regions, the higher the UV radiation levels.


CLOUD COVER:
UV radiation levels are highest under cloudless skies but even with cloud cover, UV radiation levels can be high.


ALTITUDE:
At higher altitudes, a thinner atmosphere absorbs less UV radiation.


OZONE:
Ozone absorbs some of the UV radiation that would otherwise reach the Earth’s surface.

 

GROUND REFLECTION: UV radiation is reflected or scattered to varying extents by different surfaces.

 

UV radiation



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