The Milky Way has a complex magnetic field that has been studied through the modeling of pulsar rotation and dispersion measures. While researchers agree that the field is predominantly azimuthal, there is debate over whether it follows a spiral or circular pattern. New methods, such as Zeeman splitting of OH masers, provide insights into the direction and magnitude of the magnetic field in star-forming regions. Data from a recent survey using the Very Large Array will help refine models of the Milky Way’s magnetic field. This ongoing research sheds light on the intricate nature of our galaxy’s magnetic environment.
https://lweb.cfa.harvard.edu/~reid/bfield.html