Levy model for interstellar scintillations

Details Levy model for interstellar scintillations Levy model for interstellar scintillations

2003-09-23

arxiv.org/abs/astro-ph/0309644v1

Phys.Rev.Lett. 91 (2003) 131101

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.91.131101

Observations of radio signals from distant pulsars provide a valuable tool for investigation of interstellar turbulence. The time-shapes of the signals are the result of pulse broadening by the fluctuating electron density in the interstellar medium. While the scaling of the shapes with the signal frequency is well understood, the observed anomalous scaling with respect to the pulsar distance has remained a puzzle for more than 30 years. We propose a new model for interstellar electron density fluctuations, which explains the observed scaling relations. We suggest that these fluctuations obey Levy statistics rather than Gaussian statistics, as assumed in previous treatments of interstellar scintillations.

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