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Fig. 4.


Expected values of RM for a CNM cloud given a typical electron density for the CNM of ne = 0.02 cm−3 (Ferrière 2020). RM is shown as a function of the strength of magnetic-field component parallel to the line of sight, B, and of the line-of-sight thickness of the cloud, ΔLOS. Orange contours show RM values of 1, 2.5, 5, 10, and 20 rad m−2. Vertical white lines and shades correspond to the median and standard deviation of B found in the CNM (Heiles & Troland 2005). The horizontal white line indicates the standard size of a CNM cloud (Ferrière 2020). Two red stars mark the values of RM found in Thomson et al. (2019) and associated with CNM clouds.

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