Physics – Optics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229...73g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Nov. 1, 1987, p. 73-102.
Physics
Optics
29
Caustics (Optics), Electron Distribution, Radio Sources (Astronomy), Scintillation, Geometrical Optics, Interstellar Matter, Power Spectra, Pulsars, Refractivity
Scientific paper
The authors consider the scintillation properties of compact radio sources for a spectrum of interstellar electron density fluctuations which is a power law over a finite range of spatial frequencies. In particular, if the power law is truncated at an inner scale intermediate between the diffractive scale and the refractive scale, the authors find that there is additional power in the spectrum of the intensity variations at these scales. This power is associated with strong focusing events, or caustics. These events are best described as simple diffraction catastrophes, which are classified and analysed on the basis of geometrical and wave optics, taking account of the strong dispersion of the ISM scattering, which introduces important frequency dependencies.
Blandford Roger. D.
Goodman Jeremy J.
Narayan Ramesh
Romani Roger W.
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