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Mapping solar magnetic fields from the photosphere to the base of the corona

Hara, Hirohisa; De Pontieu, Bart; Carlsson, Mats +25 more

Routine ultraviolet imaging of the Sun's upper atmosphere shows the spectacular manifestation of solar activity; yet we remain blind to its main driver, the magnetic field. Here we report unprecedented spectropolarimetric observations of an active region plage and its surrounding enhanced network, showing circular polarization in ultraviolet (Mg I…