Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220...19r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 1, 1986, p. 19-49.
Astronomy and Astrophysics
Astronomy
92
Interstellar Matter, Pulsars, Radio Wave Refraction, Scintillation, Astronomical Models, Autocorrelation, Cross Correlation, Electron Density (Concentration), Fluctuation Theory, Refraction
Scientific paper
Recent studies have focused attention on the refractive effects of long-wavelength (⪉1014cm) electron density fluctuations in the interstellar medium upon radio observations of pulsars and compact extragalactic radio sources. In earlier work, a simple scattering model was introduced by the authors. In this work, they extend the analysis to include refraction-induced fluctuations in intrinsically diffractive quantities such as the scintillation time-scale, ts, and the decorrelation bandwidth, νdc. They then use the theory to study the drifting bands in dynamic scintillation spectra caused by the dispersive steering of the diffraction pattern. They also estimate the fluctuations in the position of the image on the sky, rates of variation of intensity and position, and the root mean square elongation of the scatter-broadened image.
Blandford Roger
Narayan Ramesh
Romani Roger W.
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