期刊
ASTROPHYSICAL JOURNAL
卷 758, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/758/1/43
关键词
Sun: activity; Sun: oscillations
资金
- UK Science Technology and Facilities Council (STFC)
- NASA [NNX10AE60G]
- NSF [ATM-0737770]
- STFC [ST/J001163/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001163/1] Funding Source: researchfish
- NASA [NNX10AE60G, 135081] Funding Source: Federal RePORTER
The solar magnetic activity cycle causes changes in the Sun on timescales that are equivalent to human lifetimes. The minimum solar activity that preceded the current solar cycle (cycle 24) was deeper and quieter than any other recent minimum. Using data from the Birmingham Solar Oscillations Network (BiSON), we show that the structure of the solar sub-surface layers during the descending phase of the preceding cycle (cycle 23) was very different from that during cycle 22. This leads us to believe that a detailed examination of the data would have led to the prediction that the cycle 24 minimum would be out of the ordinary. The behavior of the oscillation frequencies allows us to infer that changes in the Sun that affected the oscillation frequencies in cycle 23 were localized mainly to layers above about 0.996 R-circle dot, depths shallower than about 3000 km. In cycle 22, on the other hand, the changes must have also occurred in the deeper-lying layers.
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