(320 to 400 namometer wavelength) not readily affected by ozone levels. Most of these waves reach the earth and contribute to skin aging and eye damage.
UVA is that part of the UV spectrum between 315 and 400 nanometers. Of the three components of UV, UVA has the longest wavelength allowing it to penetrate to the skin's dermis where it damages collagen and elastin causing wrinkles – leading to the mnemoic “A for aging”. UVA also harms DNA and compromises the skin's natural capability to fight cancer. On the other hand, UVA also plays an essential role in the formation of Vitamin D.
Ultraviolet Radiation Band "A". Often given as 320 to 400 nm (nanometers).
ultraviolet light type A, with a wavelength of 320-400nm; causes aging and damage to the elastin and collagen in the skin as well as tanning
a band of ultraviolet radiation with wavelengths from 320-400 nanometers produced by the Sun. UVA is not absorbed by ozone. This band of radiation has wavelengths just shorter than visible violet light. NASA provides more information on their web site.
Ultraviolet light, type A - rays of light from the sun that are not visible but can cause damage to the skin. Approximate wavelength: 320 to 400 nanometers. UVA rays penetrate deeply into the skin. . "The sun aging rays."
The so-called tanning spectrum of Ultraviolet light rays. UVA is the light emitted by tanning beds and penetrates much deeper than UVB, even into the muscle.
UVA is a type of UV radiation. This type all reaches the earth's surface, and along with UVB causes skin damage.
The ultraviolet light frequency that causes tanning of the skin. All tanning bed lamps produce some ratio of UVA and UVB rays.
Ultraviolet light, type A. These are rays of light from the sun which are not visible but can cause damage to the skin.
Ultraviolet radiation, usually defined to be in the range from 320 to 380 nm.
damaging rays from the sun, believed to create wrinkles and premature aging
Ultraviolet radiation A (wavelengths between 320-400 nm)
UV Absorbers, a group of additives which protect organic materials by absorbing the UV radiation.