Radio Scintillation Due to Discontinuities in the Interstellar Plasma Density

Details Radio Scintillation Due to Discontinuities in the Interstellar Plasma Density Radio Scintillation Due to Discontinuities in the Interstellar Plasma Density

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...18911706l&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #117.06; Bulletin of the American Astronomical Society, Vol. 28, p.1429

Astronomy and Astrophysics

Astronomy

Scientific paper

We develop the theory of interstellar scintillation as caused by an irregular plasma having a power-law spatial density spectrum with a spectral index of beta = 4 corresponding to a medium with abrupt changes in its density. An ``outer scale'' is included in the model representing the range over which the density of the medium remains uniform. Such a spectrum could be used to model plasma shock fronts in supernova remnants. We investigate and develop equations for pulse broadening, decorrelation bandwidth of diffractive scintillations, and the refractive scintillation index and compare our results with pulsar measurements. We consider both a medium concentrated in a thin layer and an extended irregular medium. We conclude that the beta = 4 model gives satisfactory agreement for many diffractive measurements, but that for the refractive scintillation index, it gives less satisfactory agreement than does the Kolmogorov turbulence spectrum. We propose to investigate a composite spectrum, featuring a uniform background turbulence with randomly distributed discrete objects, as modelled by the beta = 4 spectrum.

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