Investigation of pulsar diffractive scintillation at 4.75 and 10.55 GHz.

Details Investigation of pulsar diffractive scintillation at 4.75 and 10.55 GHz. Investigation of pulsar diffractive scintillation at 4.75 and 10.55 GHz.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..180m&link_type=abstract

Astronomy and Astrophysics, v.308, p.180-191

Astronomy and Astrophysics

Astrophysics

20

Pulsars: General, Scattering, Interstellar Medium: Structure, Turbulence

Scientific paper

Investigations of the intensity fluctuations of 17 pulsars at 4.75 and 10.55GHz reveal two well-defined separable components. One is obviously caused by interstellar scintillation on a temporal scale of a few minutes and longer, which made it possible to extract unambiguously scintillation indices, correlation times and their dependence on frequency and distance; the other is with high certainty related to intrinsic pulse flux variations. Analysis of the correlation function, the temporal structure function and the power spectrum of pulsar scintillation in the weak regime and comparison with theoretical predictions based on the "Kolmogorov" and "broken power law" model indicate that the three-dimensional spectrum of the electron density fluctuations may be approximated by a power law with an index n>=4 on a spatial scale of 10^9^-10^11^cm. It is shown, furthermore, by analysis of the functional dependence of the critical frequency on distance, that turbulence in the interstellar medium must be nearly statistically homogeneous at distances R<=1kpc but inhomogeneous on larger scales.

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