UV-A


Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.
Related to UV-A: UV index

UV-A

(meteorology)
Ultraviolet radiation produced by the sun, ranging in wavelength from 320 to 400 nanometers, biologically; it is the least damaging of the sun's rays.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
If the measurements are of a broadband or extended source, it is best to pick a UV meter that has the closest match to the desired measurement function (such as UV-A or erythema).
Lytle says it's not yet clear whether such data will have much effect on UV-A tanning salons, since their lamps already must carry timers and labels warning that the light may contribute to aging and cancer.
Though long UV produces DNA damage with only perhaps 1/1,000 the efficiency of mid-range UV-B, he points out that UV-A penetrates light-colored skin more deeply than UV-B does.