Refractive scintillation in the interstellar medium

Details Refractive scintillation in the interstellar medium Refractive scintillation in the interstellar medium

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..666c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 15, 1987, p. 666-674.

Astronomy and Astrophysics

Astrophysics

69

Interstellar Space, Pulsars, Refractivity, Scintillation, Turbulence Effects, Stellar Models, Variable Stars

Scientific paper

The slow variation in the apparent intensity of pulsars on time scales of days to months was recently shown to be due to a large-scale component of interstellar scintillation (Rickett, Coles, and Bourgois). These variations are greater than one would expect if the turbulence spectrum were a simple Kolmogorov power law. It is shown that this large-scale component can be greatly enhanced when the turbulence spectrum has a limiting "inner scale" of the order of 109m. The authors present a solution for the covariance of refractive scintillation of an extended source in an extended medium. The results show that refractive scintillations are also responsible for slow variations in "low-frequency variables".

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