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Sunburn effect (as measured by the UV index) is the product of the sunlight power spectrum (radiation intensity) and the erythemal action spectrum (skin sensitivity) across the range of UV wavelengths. [9] [10] The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface.
The power slowly comes back on in California. 14:38, Louise Boyle. Power was being restored across California on Wednesday after nearly half a million households were left in darkness this weekend ...
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).
The Santa Ana winds in Southern California sweep from the deserts and across the Los Angeles metropolitan area pushing smoke from wildfires far out into the Pacific Ocean. The Santa Ana winds are strong, extremely dry offshore winds that characteristically sweep across Southern California and northern Baja California during late September into ...
San Luis Obispo County weathered a ferocious storm — including a now confirmed tornado — Wednesday as high winds and rain pulled down trees and closed roads.. South County and northern Santa ...
The WHO-standard ultraviolet index is a widely publicized measurement of total strength of UV wavelengths that cause sunburn on human skin, by weighting UV exposure for action spectrum effects at a given time and location. This standard shows that most sunburn happens due to UV at wavelengths near the boundary of the UVA and UVB bands.
Blazes from the Park Fire, started by an alleged arsonist who pushed a flaming car down a 60-foot gully near Chico, California, on July 24, has since burned more than 400,000 acres (162,200 ...