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We know that magnetic fields are pervasive across all scales in the Universeand over all of cosmic time and yet our understanding of many of the propertiesof magnetic fields is still limited. We do not yet know when, where or how thefirst magnetic fields in the Universe were formed, nor do we fully understandtheir role in fundamental processes such as galaxy formation or cosmic rayacceleration or how they influence the evolution of astrophysical objects. Thegreatest challenge to addressing these issues has been a lack of deep, broadbandwidth polarimetric data over large areas of the sky. The Square KilometreArray will radically improve this situation via an all-sky polarisation surveythat delivers both high quality polarisation imaging in combination withobservations of 7-14 million extragalactic rotation measures. Here we summarisehow this survey will improve our understanding of a range of astrophysicalphenomena on scales from individual Galactic objects to the cosmic web.

Using SKA Rotation Measures to Reveal the Mysteries of the Magnetised Universe