Whitepaper #218 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: other basic research; solar physics.
Detection of Faraday rotation (FR) is one of the best radio remote-sensing methods for probing the plasma structure, including the magnetic field, of the solar wind and coronal mass ejections (CMEs). We outline several recommendations to continue developing FR methods over the next decade.