Colorimetric Description of Radiation Emerging from the Top of a Rayleigh Atmosphere PDF Download
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Author: C. R. Nagaraja Rao
Publisher:
ISBN:
Category : Radiation
Languages : en
Pages : 30
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Book Description
The trichromatic coefficients of light emerging from the top of a plane parallel, purely scattering Rayleigh (molecular) atmosphere have been computed. The extraterrestrial illumination from the sun is approximated with illumination from the CIE standard illuminant C. The ground is assumed to reflect radiation according to the Lambert law. The results are expressed in terms of the dominant wavelength and associated values of excitation purity. It is found that when the diffuse reflectivity of the ground assumes moderate to high values (0.25 to 0.8), the excitation purity of the emergent light is so small as to cause an overall 'neutral grey' or 'neutral white' appearance. On the other hand when the ground is non reflecting or when the diffuse reflectivity is very low, the dominant wavelength of the emergent radiation lies in the blue region and the associated excitation purity exhibits fairly high values (40%). It is possible that computations such as the above, when extended to more realistic models of the atmosphere, may find application in problems related to color-photographic reconnaissance from high altitudes. (Author).
Author: C. R. Nagaraja Rao
Publisher:
ISBN:
Category : Radiation
Languages : en
Pages : 30
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Book Description
The trichromatic coefficients of light emerging from the top of a plane parallel, purely scattering Rayleigh (molecular) atmosphere have been computed. The extraterrestrial illumination from the sun is approximated with illumination from the CIE standard illuminant C. The ground is assumed to reflect radiation according to the Lambert law. The results are expressed in terms of the dominant wavelength and associated values of excitation purity. It is found that when the diffuse reflectivity of the ground assumes moderate to high values (0.25 to 0.8), the excitation purity of the emergent light is so small as to cause an overall 'neutral grey' or 'neutral white' appearance. On the other hand when the ground is non reflecting or when the diffuse reflectivity is very low, the dominant wavelength of the emergent radiation lies in the blue region and the associated excitation purity exhibits fairly high values (40%). It is possible that computations such as the above, when extended to more realistic models of the atmosphere, may find application in problems related to color-photographic reconnaissance from high altitudes. (Author).
Author:
Publisher: Univ of California Press
ISBN:
Category :
Languages : en
Pages : 564
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Book Description
Author: Anne B. Kahle
Publisher:
ISBN:
Category : Rayleigh scattering
Languages : en
Pages : 24
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Book Description
Theoretically derived values of the directional intensity of radiation emerging from both the top and the bottom of a Rayleigh scattering atmosphere are presented graphically. The model assumes a plane-parallel atmosphere illuminated by the sun, with either a completely absorbing planetary surface or Lambert ground reflection. By using Mullikin's and Sekera's recent modification of Chandrasekhar's radiative-transfer theory, the intensities were obtained for much larger values of the optical thickness of the atmosphere than was previously possible. These intensities are given for a wide range of optical thicknesses, solar zenith angles, and directions of emergence. (Author).
Author: Kinsell L. Coulson
Publisher:
ISBN:
Category : Radiation
Languages : en
Pages : 568
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Author: Anne B. Kahle
Publisher:
ISBN:
Category : Astrophysics
Languages : en
Pages : 22
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Calculations of the total radiation emerging from planetary atmospheres optically thicker than those of the earth. For Rayleigh scattering and Lambert reflectivity, the flux is determined for a wide range of solar elevations, ground reflectivities, and optical depths. For very large surface reflectivities there is more radiation downward onto a planet at the bottom of a thick atmosphere than is received at the top because the radiation that does penetrate undergoes multiple reflection. The total radiation absorbed by the surface plus the corresponding diffuse upward radiation always equals the input flow. Bond albedo is determined by numericaly integration. It approaches the value of the ground reflectivity as optical thickness approaches zero, and approaches 1 as it becomes very large. (Author).
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Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1264
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Author:
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 590
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Author: Library of Congress. Exchange and Gift Division
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ISBN:
Category : State government publications
Languages : en
Pages : 76
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Book Description
An annual index to the monographs appears early in the following year.
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Publisher:
ISBN:
Category : Science
Languages : en
Pages : 840
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Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 762
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