Practically all natural daytime light at the earth’s surface originates in the sun. The fluence rate, as well as spectral and directional distributions, is modified by the gases, clouds, and aerosols in the atmosphere in a way that depends on time and place, as well as by vegetation, snow, and other ground cover. A special section in this chapter is devoted to ultraviolet radiation.
KeywordsUltraviolet Radiation Fluence Rate Spectral Irradiance Ozone Column Solar Spectral Irradiance
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