The outer turbulence scale in the interstellar plasma |
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| Authors: | V I Shishov T V Smirnova |
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| Institution: | (1) Pushchino Radio Astronomy Observatory, Pushchino, Russia |
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| Abstract: | The structure function for phase fluctuations on spatial scales from 106 to 1017 m is constructed using data on diffractive and refractive scintillation of pulsars, scattering angles, variations in pulse arrival times, and differences in dispersion measures observed for close pairs of pulsars in globular clusters. For distances R>1 kpc (a sample of pulsars with DM≥30 pc/cm3), the fluctuations in the interstellar electron density on scales from 106 to 1014 m are well described by a Kolmogorov spectrum with index 11/3. Analysis of variations in the dispersion measures for close pairs of pulsars in globular clusters indicates an outer turbulence scale of L 0=1015 m. The relative level of turbulent fluctuations is determined for the interstellar plasma, and the important role of turbulence in the energy balance is demonstrated. |
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