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Typical variation of UV index by time of day and time of year, around 40.71 -74.01, based on FastRT UV Calculator [4] The UV index is a linear scale that measures the intensity of UV radiation with respect to sunburn.
Highest heat index: In the observation above at Dhahran, Saudi Arabia, the heat index ("feels like" temperature) was 81.1 °C (178.0 °F). [ 201 ] Highest temperature with 100% relative humidity : A temperature of 34 °C (93 °F) with 100% relative humidity in Jask , Iran , on 21 July 2012.
Sunburn effect (as measured by the UV Index) is the product of the sunlight spectrum at the Earth's surface (radiation intensity) and the erythemal action spectrum (skin sensitivity). Long-wavelength UV is more prevalent, but each milliwatt at 295 nm produces almost 100 times more sunburn than at 315 nm.
The all-time high of 121 °F (49 °C) [35] nearly rivals the record high temperatures of Phoenix, Arizona (122 °F (50 °C)) and Palm Springs (123 °F (51 °C)). The city of Burbank, at the eastern end of the Valley, is also known for being significantly hotter than downtown Los Angeles, which is only 9 miles (14 km) to the south.
At least three people have been killed by falling trees and more than 150,000 households have lost power
[17] [18] [19] UVB radiation does not penetrate glass, so exposure to sunshine indoors through a window does not produce vitamin D. [20] Time of day, time of year, geographic latitude, ground altitude, cloud cover, smog, skin melanin content, and sunscreen are among the factors that greatly affect UV intensity and vitamin D synthesis, [19 ...
Extreme ultraviolet composite image of the Sun (red: 21.1 nm, green: 19.3 nm, blue: 17.1 nm) taken by the Solar Dynamics Observatory on August 1, 2010 13.5 nm extreme ultraviolet light is used commercially for photolithography as part of the semiconductor fabrication process.