: Survey of cosmic magnetic fields

Cosmic magnetic fields are pervasive in interstellar and intercluster space, and magnetism is one of the four fundamental forces. They are known to play important roles in the processes of star formation, turbulence, cosmic-ray acceleration and galaxy formation. However, the origin and structure of the cosmic magnetic fields and their roles in the above mentioned processes are poorly known. In this talk, I will review the understanding of the cosmic magnetic field. Focus will be given to the Galactic magnetic field revealed by the Faraday rotation of the linearly polarized radiation. Then I will briefly mention a survey science of cosmic magnetism, one of the key sciences
of the SKA (Square Kilometre Array), that will certainly provide new insights on cosmic magnetic fields.


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