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Infra‐red absorption, scattering, and total attenuation cross‐sections for water spheres
Author(s) -
Herman B. M.
Publication year - 1962
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49708837604
Subject(s) - attenuation , absorption (acoustics) , scattering , absorption cross section , wavelength , spheres , mie scattering , cross section (physics) , optics , materials science , atomic physics , computational physics , physics , light scattering , quantum mechanics , astronomy
Calculations of the normalized absorption, scattering, and total attenuation cross‐sections of water spheres are presented for the wavelength range from 4 μ to 24 μ, at intervals of 1 μ for the wavelength interval from 4 μ to 10 μ, and at 2 μ intervals thereon to 24 μ. The calculations have been carried out to values of α (α is the ratio of sphere circumference to wavelength) of 30. For values of the Mie absorption parameter, k , greater than approximately 0·10, values of the normalized absorption cross‐section are shown to have a maximum which exceeds unity by an appreciable amount. In all instances, the values of the normalized scattering and total attenuation cross‐sections exceed unity over most ranges of α considered, the excess over unity being greater for small values of absorption. Some rough calculations are made comparing Mie absorption coefficients with those for bulk‐water absorption at the same wavelength.