Whitepaper #191 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: other basic research; inner heliosphere; other space weather; space-based missions/projects.
The Faraday Effect Tracker of Coronal and Heliospheric structures (FETCH) instrument, one of ten instruments proposed to be hosted on the MOST mission spacecraft will analyze solar wind CMEs and other disturbances. Through radio propagation, FETCH will obtain plasma magnetic field, density, and variability with Faraday rotation, Total Electron Content, and plasma velocity.