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A series of HMI magnetograms of sunspot #AR 12673, which produced multiple large eruptions as it crossed the disk of the Sun in September 2017: (a) at 0000 UT on 9/1, (b) at 0900 UT on 9/5, roughly 24 hours before this sunspot produced an X-class solar flare, and (c) at 1000 UT on 9/7, around the time of an M-class flare.
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