Vol. 24, issue 03, article # 7
Gurvich A. S., Vorob'ev V. V., Fedorova O. V. Strong scintillation spectra behind the atmosphere with large- and small scale inhomogeneities. // Optika Atmosfery i Okeana. 2011. V. 24. No. 03. P. 205-215 [in Russian].Copy the reference to clipboard
Abstract:
The numerical examination of 2D spectra of strong stellar scintillations, observed through an Earth's atmosphere from space, is carried out. The atmosphere contains a combination of statistically independent, anisotropic large-scale and isotropic small-scale inhomogeneities of the index of refraction. 2D spectra and calculated on them vertical and horizontal 1D spectra are presented. It is shown, that the strong scintillation spectra are not equal to the sum of spectra, formed by separate, statistically independent components. The combination of large- and small-scale inhomogeneities results in the greater dispersion of scintillations in comparison with the absence of last ones. However, the presence of this combination can cause both the increase and the decrease of dispersion in comparison with the sum of dispersions of anisotropic and isotropic components, depending on their intensities. The new effect in 1D horizontal spectra is found in the small wave number region: the presence of small-scale atmospheric inhomogeneities results in suppression of scintillation spectral power, formed by only anisotropic component.
Keywords:
sounding of atmosphere from space, turbulence, anisotropic and isotropic irregularities, strong scintillation spectra, two-component phase screen