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Fig. B.1.
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View of the Sun’s disk on the 2023-03-21 at 16:50 UT with a grid in Carrington coordinates, from JHelioviewer. Top: SDO/AIA 171Å. Active regions are identified by NOAA. Bottom: STEREO A/EUVI 304Å. The extension of these ARs is circled in green.
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