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Unusual Light Structure in the NOAA 12109 Sunspot Umbra: Observations and Preliminary Results |
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| Authors: | Ozhogina O. A. |
| Affiliation: | 1.Institute of Solar–Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, Irkutsk, 664033, Russia ; |
| Abstract: | Astronomy Letters - On July 12, 2014, an unusual light structure was observed in the NOAA 12109 sunspot umbra at the Horizontal Solar Telescope of the Sayan Observatory. It differed from... |
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