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Jun 13, 2002 · Overview. The Global Solar UV Index (UVI) described in this document is a simple measure of the UV radiation level at the Earth’s surface and an indicator of the potential for skin damage. It serves as an important vehicle to raise public awareness and to alert people about the need to adopt protective measures when exposed to UV radiation.
May 10, 2024 · En termes scientifiques, le rayonnement ultraviolet est composé de rayonnements électromagnétiques, tout comme la lumière visible, de signaux radar et de signaux radio (voir la figure 1). Les rayonnements électromagnétiques sont transmis sous la forme d'ondes. Les ondes peuvent être décrites par leur longueur d'onde ou par leur ...
Nov 16, 2022 · Ultraviolet (UV) radiation is a form of energy that the sun produces. You can’t see UV radiation because its wavelengths are shorter than visible light. The UV energy that the sun produces reaches the Earth and provides vitamin D for your body to help you survive.
Oct 24, 2023 · The ozone layer shields the Earth from harmful ultraviolet (UV) radiation. Ozone depletion, as well as seasonal and weather variations, cause different amounts of UV radiation to reach the Earth at any given time. The UV Index predicts the ultraviolet radiation levels on a 1-11+ scale, helping people determine appropriate sun-protective ...
Ultraviolet radiation lies between visible light and X-rays along the electromagnetic spectrum. UV "light" spans a range of wavelengths between about 10 and 400 nanometers. The wavelength of violet light is around 400 nanometers (or 4,000 Å). Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 10 12 hertz) and 30,000 ...
Use sunscreen of at least SPF-30. Stay in shade near midday when the sun is strongest. 6-7. ("High") A UV Index reading of 6 to 7 means high risk of harm from unprotected sun exposure. Protection against sun damage is needed. Reduce time in the sun between 10 a.m. and 4 p.m.
The UV Index is a tool you can use to protect yourself from UV radiation. It tells you the times during the day that you need to be SunSmart. The UV Index divides UV radiation levels into: low (1-2) moderate (3-5) high (6-7) very high (8-10) extreme (11 and above).
