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The Formation and Decay of Sunspot Penumbrae in Active Region NOAA 12673

19 Feb 2020, 17:00 UTC
The Formation and Decay of Sunspot Penumbrae in Active Region NOAA 12673
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Qiaoling Li et al 2019 ApJ 886 149
Observations of sunspots in three regions of the active region NOAA 12673 show that sunspot penumbrae evolve through the interaction of the preexisting magnetic field system and the later-emerging magnetic field system.

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