Interstellar electron density and magnetic field irregularities on 0.001 to 100 parsec scales

Physics

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Electron Density (Concentration), Interstellar Magnetic Fields, Interstellar Matter, Magnetohydrodynamic Turbulence, Nonuniform Magnetic Fields, Radio Scattering, Extragalactic Radio Sources, Faraday Effect, Power Spectra, Scintillation

Scientific paper

Faraday rotation-measure observations of extragalactic sources imply the outer scale of the irregularities of either the electron density or the magnetic field, or both, is at least as large as 1 pc. Assuming the outer scale of the magnetic field is much smaller than 1 pc, the observed structure function of RM variations is consistent with an extrapolation, to large length scales, of the Kolmogorov spectrum of electron density irregularities implied by scintillation studies. If, on the other hand, the electron density outer scale is much less than 1 pc, it is concluded that the fractional variations of electron density are much less than those of the magnetic field.

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