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We present radio continuum and polarization images of the North Polar Spur(NPS) from the Global Magneto-Ionic Medium Survey (GMIMS) conducted with theDominion Radio Astrophysical Observatory 26-m Telescope. We fit polarizationangle versus wavelength squared over 2048 frequency channels from 1280 to 1750MHz to obtain a Faraday Rotation Measure (RM) map of the NPS. Combining this RMmap with a published Faraday depth map of the entire Galaxy in this direction,we derive the Faraday depth introduced by the NPS and the Galactic interstellarmedium (ISM) in front of and behind the NPS. The Faraday depth contributed bythe NPS is close to zero, indicating that the NPS is an emitting only feature.The Faraday depth caused by the ISM in front of the NPS is consistent with zeroat b>50 degree, implying that this part of the NPS is local at a distance ofapproximately several hundred parsecs. The Faraday depth contributed by the ISMbehind the NPS gradually increases with Galactic latitude up to b=44 degree,and decreases at higher Galactic latitudes. This implies that either the partof the NPS at b<44 degree is distant or the NPS is local but there is a signchange of the large-scale magnetic field. If the NPS is local, there is then noevidence for a large-scale anti-symmetry pattern in the Faraday depth of theMilky Way. The Faraday depth introduced by the ISM behind the NPS at latitudesb>50 degree can be explained by including a coherent vertical magnetic field.

Faraday Tomography of the North Polar Spur: Constraints on the distance to the Spur and on the Magnetic Field of the Galaxy