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A helioseismic perspective on the depth of the minimum between solar cycles 23 and 24
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Broomhall, Anne-Marie (2017) A helioseismic perspective on the depth of the minimum between solar cycles 23 and 24. Solar Physics, 292 (4). 67. doi:10.1007/s11207-017-1068-5
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Official URL: http://doi.org/10.1007/s11207-017-1068-5
Abstract
The solar-activity-cycle minimum observed between Cycles 23 and 24 is generally regarded as being unusually deep and long. That minimum is being followed by one of the smallest amplitude cycles in recent history. We perform an in-depth analysis of this minimum with helioseismology. We use Global Oscillation Network Group (GONG) data to demonstrate that the frequencies of helioseismic oscillations are a sensitive probe of the Sun’s magnetic field: The frequencies of the helioseismic oscillations were found to be systematically lower in the minimum following Cycle 23 than in the minimum preceding it. This difference is statistically significant and may indicate that the Sun’s global magnetic field was weaker in the minimum following Cycle 23. The size of the shift in oscillation frequencies between the two minima is dependent on the frequency of the oscillation and takes the same functional form as the frequency dependence observed when the frequencies at cycle maximum are compared with the cycle-minimum frequencies. This implies that the same near-surface magnetic perturbation is responsible. Finally, we determine that the difference in the mean magnetic field between the minimum preceding Cycle 23 and that following it is approximately 1G.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QB Astronomy | ||||||
| Divisions: | Other > Institute of Advanced Study Faculty of Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Helioseismology, Solar oscillations, Solar cycle | ||||||
| Journal or Publication Title: | Solar Physics | ||||||
| Publisher: | Springer Netherlands | ||||||
| ISSN: | 0038-0938 | ||||||
| Official Date: | 10 April 2017 | ||||||
| Dates: |
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| Date of first compliant deposit: | 27 April 2017 | ||||||
| Volume: | 292 | ||||||
| Number: | 4 | ||||||
| Article Number: | 67 | ||||||
| DOI: | 10.1007/s11207-017-1068-5 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Funder: | United States. National Aeronautics and Space Administration (NASA), United States. Office of Naval Research, National Science Foundation (U.S.) (NSF) | ||||||
| Open Access Version: |
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