Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982azh....59..246s&link_type=abstract
(Astronomicheskii Zhurnal, vol. 59, Mar.-Apr. 1982, p. 246-252.) Soviet Astronomy, vol. 26, Mar.-Apr. 1982, p. 151-154. Transla
Astronomy and Astrophysics
Astronomy
2
Decimeter Waves, Extragalactic Radio Sources, Scintillation, Interstellar Matter, Power Spectra, Radiant Flux Density
Scientific paper
Recent data on the variability of extragalactic sources at decimeter wavelengths are interpreted in terms of the hypothesis that scintillations in their radio emission are produced by irregular interstellar structures in the Galaxy: loops, spurs, ridges. The behavior of the scintillation index over a wide frequency range (0.325-2.7 GHz) can be explained by the theory of scintillation at large-scale irregularities taking place in the weak-focusing regime at the boundary of the strong-focus zone. Corrections are necessary for the finite angular size of the source (caused by the interstellar scattering) or for self-absorption of the scintillating component at the low-frequency limit of the band observed.
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