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Paper: Density Distribution of the Warm Ionized Medium
Volume: 365, SINS — Small Ionized and Neutral Structures in the Diffuse Interstellar Medium
Page: 250
Authors: Hill, A.S.; Reynolds, R.J.; Benjamin, R.A.; Haffner, L.M.
Abstract: Observations of Hα emission measures and pulsar dispersion measures at high Galactic latitude (|b| > 10°) provide information about the density and distribution of the diffuse warm ionized medium (WIM). The diffuse WIM has a lognormal distribution of EMsin |b|, which is consistent with a density structure established by isothermal turbulence. The H+ responsible for most of the emission along high-EMsin |b| sightlines is clumped in high density (> 0.1 cm−3) regions that occupy only a few parsecs along the line of sight, while the H+ along low-EM sightlines occupies hundreds of parsecs with considerably lower densities.
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