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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 .
Rayleigh scattering causes the blue color of the daytime sky and the reddening of the Sun at sunset. Rayleigh scattering (/ ˈ r eɪ l i / RAY-lee) is the scattering or deflection of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation.
Both artificial and natural objects in the sky can be very difficult to detect using only the intensity of light. These objects include clouds, satellites, and aircraft. However, the polarization of these objects due to resonant scattering, emission, reflection, or other phenomena can differ from that of the background illumination. Thus they ...
Thin clouds may look white or appear to have acquired the color of their environment or background. High tropospheric and non-tropospheric clouds appear mostly white if composed entirely of ice crystals and/or supercooled water droplets.
Scattering adds the sky light as a veiling luminance onto the light from the object, reducing its contrast with the background sky light. Sky light usually contains more light of short wavelength than other wavelengths (this is why the sky usually appears blue), which is why distant objects appear bluish.
Cloud seeding, a fascinating weather modification technique, involves introducing substances like silver iodide, salt, or dry ice into clouds to encourage the formation of raindrops or snowflakes.
Particles in the air scatter short-wavelength light (blue and green) through Rayleigh scattering much more strongly than longer-wavelength yellow and red light. Loosely, the term crepuscular rays is sometimes extended to the general phenomenon of rays of sunlight that appear to converge at a point in the sky, irrespective of time of day. [3] [4]
This is an accepted version of this page This is the latest accepted revision, reviewed on 10 December 2024. Color "Sky (color)" redirects here. For other uses, see Sky Blue (disambiguation). Sky blue Common connotations boys, daylight, water, air, paleness Colour coordinates Hex triplet #87CEEB sRGB B (r, g, b) (135, 206, 235) HSV (h, s, v) (197°, 43%, 92%) CIELCh uv (L, C, h) (79, 46, 223 ...
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