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- W2981342022 abstract "To better understand the formation and decay of sunspot penumbra, we studied the evolution of sunspots in the three regions of the active-region NOAA 12673 in detail. The evolution of sunspots in the three regions were all involved in the interaction of two magnetic field systems: the pre-existing magnetic field system and the later emerging magnetic field system. Through analyzing the photospheric magnetic field properties, it is found that the formation of the penumbra originated from the newly emerging magnetic bipole that were trapped in the photosphere. The change of magnetic fields in penumbra from horizontal to vertical can cause the disappearance of penumbra. The transformation of the magnetic field between the umbra and the penumbra is found and the outward moat flow around sunspot gradually decreased and vanished during the decay of sunspot. In addition, we found that the mean longitudinal magnetic strength in penumbra decreased and the mean transverse magnetic strength in penumbra increased with the increasing penumbral area during the formation of sunspots. However, during the decay of sunspots, the mean longitudinal magnetic strength in penumbra increased and the mean transverse magnetic strength in penumbra decreased with the decreasing penumbral area. Comparatively, the dependence of the area and the mean transverse/longitudinal magnetic field strength in umbra is not remarkable. These results reveal that the formation and decay process of umbra are different with penumbra." @default.
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- W2981342022 date "2019-12-03" @default.
- W2981342022 modified "2023-10-12" @default.
- W2981342022 title "The Formation and Decay of Sunspot Penumbrae in Active Region NOAA 12673" @default.
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- W2981342022 doi "https://doi.org/10.3847/1538-4357/ab4f84" @default.
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