![]() Current telescopes and instrument can only measure the coronal magnetic field strength over a small field of view. The CEL circular polarization signals allow us to infer the magnetic field strength in the corona, and is critically important for our understanding of the solar corona. However, reliable and regular measurements of the circular polarization signals of the CELs remain illusive. With the successful construction of the Coronal Multichannel Magnetometer (CoMP) instrument, observations of the linear polarization of the coronal emission lines (CELs), which carry information about the azimuthal direction of the coronal magnetic fields, are now routinely available. Tremendous progress has been made in the field of observational coronal magnetometry in the first decade of the Twenty-First century. Institute for Astronomy, University of Hawaii, Pukalani, HI, USA.
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