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Two‐frequency intensity cross‐spectrum
Author(s) -
Codona Johanan L.,
Creamer Dennis B.,
Flatté Stanley M.,
Frehlich R. G.,
Henyey Frank S.
Publication year - 1986
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs021i005p00805
Subject(s) - monochromatic color , intensity (physics) , angular spectrum method , fourier transform , moment (physics) , plane wave , cross spectrum , gaussian , optics , spectrum (functional analysis) , physics , scattering , mathematics , computational physics , mathematical analysis , frequency domain , quantum mechanics , diffraction
The intensity cross‐spectrum (spatial Fourier transform of the two‐frequency intensity correlation) for scintillations caused by a plane wave passing through a random phase screen is considered. Two series solutions (one valid for low and the other for high spatial frequencies) are obtained which are the generalizations of previous results for the monochromatic intensity spectrum. We show that the Gaussian‐field approximation (modeling the cross‐spectrum as the transform of the square of the second moment) breaks down when the outer scale is large compared with the diameter of the scattering disk.