"Red sky" redirects here. For other uses, see Red Sky (disambiguation).
In Earth's atmosphere, the dominant scattering efficiency of blue light is compared to red or green light. Scattering and absorption are major causes of the attenuation of sunlight radiation by the atmosphere. During broad daylight, the sky is blue due to Rayleigh scattering, while around sunrise or sunset, and especially during twilight, absorption of irradiation by ozone helps maintain blue color in the evening sky. At sunrise or sunset, tangentially incident solar rays illuminate clouds with orange to red hues.The visible spectrum, approximately 380 to 740 nanometers (nm),[1] shows the atmospheric water absorption band and the solar Fraunhofer lines. The blue sky spectrum contains light at all visible wavelengths with a broad maximum around 450–485 nm, the wavelengths of the color blue.
Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere. It is also called sky radiation, the determinative process for changing the colors of the sky. Approximately 23% of direct incident radiation of total sunlight is removed from the direct solar beam by scattering into the atmosphere; of this amount (of incident radiation) about two-thirds ultimately reaches the earth as photon diffused skylight radiation.[citation needed]
The dominant radiative scattering processes in the atmosphere are Rayleigh scattering and Mie scattering; they are elastic, meaning that a photon of light can be deviated from its path without being absorbed and without changing wavelength.
Under an overcast sky, there is no direct sunlight, and all light results from diffused skylight radiation.
Proceeding from analyses of the aftermath of the eruption of the Philippines volcano Mount Pinatubo (in June 1991) and other studies:[2][3] Diffused skylight, owing to its intrinsic structure and behavior, can illuminate under-canopy leaves, permitting more efficient total whole-plant photosynthesis than would otherwise be the case; this in stark contrast to the effect of totally clear skies with direct sunlight that casts shadows onto understory leaves and thereby limits plant photosynthesis to the top canopy layer, (see below).
^Starr, Cecie (2006). Biology: Concepts and Applications. Thomson Brooks/Cole. p. 94. ISBN 978-0-534-46226-0.
^Cite error: The named reference web.archive.org was invoked but never defined (see the help page).
^Young, Donald; Smith, William (1983). "Effect of Cloudcover on Photosynthesis and Transpiration in the Subalpine Understory Species Arnica Latifolia". Ecology. 64 (4): 681–687. Bibcode:1983Ecol...64..681Y. doi:10.2307/1937189. JSTOR 1937189.
and 26 Related for: Diffuse sky radiation information
Diffuseskyradiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by molecules or particulates...
in Earth's atmosphere causes diffuseskyradiation, which is the reason for the blue color of the daytime and twilight sky, as well as the yellowish to...
two hours after the Sun has set, casting a diffuse glow across the surface of Mars. Dawn Diffuseskyradiation Earth's shadow, visible at sunset Golden...
Basin Diffuseskyradiation, solar radiation reaching the Earth's surface after Rayleigh scattering Rayleigh scattering, which causes the sky to appear...
kilometres into outer space. Coronal light is typically obscured by diffuseskyradiation and glare from the solar disk, but can be easily seen by the naked...
long horizon paths gives the zenith sky its blueness when the sun is near the horizon". See diffuseskyradiation for more details. The Sun may be said...
predicted by the law of reflection. Reflections of radiation that undergo scattering are often called diffuse reflections and unscattered reflections are called...
indirect sunlight during the daytime. This includes direct sunlight, diffuseskyradiation, and (often) both of these reflected by Earth and terrestrial objects...
compared to the effect of losses on DNI. Diffuse horizontal irradiance (DHI), or diffuseskyradiation is the radiation at the Earth's surface from light scattered...
detector, or film) and reduces the incidence of diffuseradiation on it. The first diffusion radiation grid was developed in 1913 by Gustav Peter Bucky...
Skye Comics, an American comic book line Diffuseskyradiation Red sky at morning (disambiguation) Red sky at night (disambiguation) This disambiguation...
(see Brewster's angle for how this works) as well as by polarized diffuseskyradiation (skylight). Besides the standard model there are several different...
the same rule applies to festival days. Belt of Venus Blue hour Diffuseskyradiation Earth's shadow, visible at twilight Gloom Green flash Polar night...
is thermal radiation. This energy is partially absorbed and scattered in the atmosphere, the latter process being the reason why the sky is visibly blue...
occurs when looking directly overhead and at a higher altitude. Diffuseskyradiation H-B de Saussure, Description d'un cyanomètre ou d'un appareil destiné...
Background Explorer (COBE) mission was to take precise measurements of the diffuseradiation between 1 micrometre and 1 cm (0.39 in) over the whole celestial sphere...
Sky brightness refers to the visual perception of the sky and how it scatters and diffuses light. The fact that the sky is not completely dark at night...
of all diffuseradiation (scattered from the atmosphere) originating from any visible (non-obscured) sky directions (see diffuseskyradiation). The sum...
resolution, any EUV spectrometer must be designed to limit the effect of diffuseskyradiation. The medium and long wavelength channels of the EUVE Spectrometer...
December 2012). Imaging the Southern Sky. Springer. p. 248. ISBN 978-1461447498. "The Messier Catalog: Diffuse Nebulae". SEDS. Archived from the original...
Diffuse Infrared Background Experiment (DIRBE) was an experiment on NASA's COBE mission, to survey the diffuse infrared sky. Measurements were made with...
energy) Atmosphere of Earth Concentrated photovoltaics Diffuseskyradiation Electromagnetic radiation and health Illuminance Insolation Irradiance List of...
(see Brewster's angle for how this works) as well as by polarized diffuseskyradiation (skylight). This can be especially useful to see beneath the surface...
divergence). It is a flow pattern of deformation. diffuseskyradiation The component of incoming solar radiation that is scattered from the direct solar beam...
A gamma ray, also known as gamma radiation (symbol γ ), is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic...
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