Small-scale variations in the galactic magnetic field Rotation measure variations across extragalactic radio sources

Observations of extended extragalactic radio sources are analyzed to obtain more data on variation in Faraday rotation through the Galactic plane on angular scales of a few arcmin or less. The difference in rotation measure between components within 16 sources is determined from observations using the VLA. The data indicate that there may be some strongly turbulent lines of sight within the Galactic plane which may or may not be associated with localizable structures. 14 references