Radio wave propagation in the interstellar medium with non-Gaussian electron density fluctuations

Details Radio wave propagation in the interstellar medium with non-Gaussian electron density fluctuations Radio wave propagation in the interstellar medium with non-Gaussian electron density fluctuations

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dppjo2006b&link_type=abstract

American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I

Physics

Plasma Physics

Scientific paper

Observations of radio signals from distant pulsars provide an important tool for investigation of interstellar plasma 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 forms of the shapes, and their observed anomalous scaling with respect to pulsar distance have remained puzzles for more than 30 years. We propose that both puzzles can be naturally explained if one assumes the non-Gaussian statistics of electron-density fluctuations. We argue that these statistics are of Levy type, and a ray propagating through the interstellar medium performs a Levy flight rather than the standard Gaussian random walk. We propose that a non-Gaussian ray propagation can be the evidence of random discontinuities in the interstellar plasma, and we discuss the physical origin of such discontinuities. REFERENCES.: Boldyrev, S. & Gwinn, C. R., Phys. Rev. Lett., 91 (2003) 131101; Boldyrev, S. & Gwinn, C. R., Astrophys. J. 584 (2003) 791.

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