Fig. 2.
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Illustration of extent of solar surface from which structures at altitudes of 10 000 km, 20 000 km, 30 000 km, 50 000 km, and 100 000 km receive illumination. The background image is a full-Sun mosaic obtained on 2019 October 20 in the Mg II K line centre by the Interface Region Imaging Spectrograph (IRIS; De Pontieu et al. 2014).
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