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Ultraviolet radiation, also known as simply UV, is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight , and constitutes about 10% of the total electromagnetic radiation output from the Sun.
Effects of UV-radiation at high latitudes, where snow stays on the ground into early summer and the sun then remains at a low position even at its zenith, have been reviewed by Meyer-Rochow. [15] UV map . Exposure to ultraviolet radiation from the sun is a source of vitamin D.
Extreme UV and X-rays are produced (left of wavelength range) but comprise very small amounts of the Sun's total output power (area under the curve). Although the solar corona is a source of extreme ultraviolet and X-ray radiation, these rays make up only a very small amount of the power output of the Sun (see spectrum at right).
A UV index reading of 0 to 2 means low danger from the Sun's UV rays for the average person. Wear sunglasses on bright days. If you burn easily, cover up and use broad spectrum SPF 15+ sunscreen. Bright surfaces, [26] sand, water, and snow, [18] will increase UV exposure. 3–5: Yellow "Moderate"
It’s long been advised that soaking up the sun is the best way ... “It only takes 15 to 20 minutes of direct sun exposure a day to get enough exposure to ultraviolet rays to spur vitamin D ...
Vitamin D, also known as the "sunshine vitamin" (yes, you can get it from sun exposure too!), is important for bone health, the immune system and even mood. If your vitamin D levels drop ...
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