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Solar radiation

Solar radiation is radiant energy emitted by the sun, particularly electromagnetic energy.

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 portion of this ultraviolet radiation that is not absorbed by the atmosphere produces a suntan or a sunburn on people who have been in sunlight for extended periods of time.

Note:   The above text is excerpted from the Wikipedia article "Solar radiation", which has been released under the GNU Free Documentation License.
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September 4, 2015

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