solar ultraviolet radiation


solar ultraviolet radiation

[′sō·lər ¦əl·trə¦vī·lət ‚rād·ē′ā·shən] (astrophysics) That portion of the sun's electromagnetic radiation that has wavelengths from about 400 to about 4 nanometers; this radiation may sufficiently ionize the earth's atmosphere so that propagation of radio waves is affected.