2008

The outer scale of turbulence in the magneto-ionized Galactic interstellar medium

Haverkorn, M., Brown, J. C., Gaensler, B. M. et al.

Understand

We analyze Faraday rotation and depolarization of extragalactic radio point sources in the direction of the inner Galactic plane to determine the outer scale and amplitude of the rotation measure power spectrum.

Structure functions of rotation measure show lower amplitudes than expected when extrapolating electron density fluctuations to large scales assuming a Kolmogorov spectral index.
This implies an outer scale of those fluctuations on the order of a parsec, much smaller than commonly assumed.
Analysis of partial depolarization of point sources independently indicates a small outer scale of a Kolmogorov power spectrum.

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