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Watson, Courtney B.; Basu, Sarbani
Astrophysical journal. Letters, 11/2020, Letnik: 903, Številka: 2Journal Article
Abstract Helioseismic data for solar cycles 23 and 24 have shown unequivocally that solar dynamics changes with solar activity. Changes in solar structure have been more difficult to detect. Basu & Mandel had claimed that the then-available data revealed changes in the He ii ionization zone of the Sun. The amount of change, however, indicated the need for larger than expected changes in the magnetic fields. Now that helioseismic data spanning two solar cycles are available, we have redone the analysis using improved fitting techniques. We find that there is indeed a change in the region around the He ii ionization zone that is correlated with activity. Because the data sets now cover two solar cycles, the time variation is easily discernible.
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