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Changes in the sensitivity of solar p-mode frequency shifts to activity over three solar cycles
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Howe, R., Chaplin, W. J., Davies, G. R., Elsworth, Y. , Basu, S. and Broomhall, Anne-Marie (2018) Changes in the sensitivity of solar p-mode frequency shifts to activity over three solar cycles. Monthly Notices of the Royal Astronomical Society: Letters, 480 (1). L79-L84. doi:10.1093/mnrasl/sly124 ISSN 1745-3933.
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Official URL: https://doi.org/10.1093/mnrasl/sly124
Abstract
Low-degree solar p-mode observations from the long-lived Birmingham Solar Oscillations Network (BiSON) stretch back further than any other single helioseismic data set. Results from BiSON have suggested that the response of the mode frequency to solar activity levels may be different in different cycles. In order to check whether such changes can also be seen at higher degrees, we compare the response of medium-degree solar p-modes to activity levels across three solar cycles using data from Big Bear Solar Observatory (BBSO), Global Oscillation Network Group (GONG), Michelson Doppler Imager (MDI) and Helioseismic and Magnetic Imager (HMI), by examining the shifts in the mode frequencies and their sensitivity to solar activity levels. We compare these shifts and sensitivities with those from radial modes from BiSON. We find that the medium-degree data show small but significant systematic differences between the cycles, with solar cycle 24 showing a frequency shift about 10 per cent larger than cycle 23 for the same change in activity as determined by the 10.7 cm radio flux. This may support the idea that there have been changes in the magnetic properties of the shallow subsurface layers of the Sun that have the strongest influence on the frequency shifts.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Helioseismology, Solar activity | |||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society: Letters | |||||||||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||||||||
Official Date: | 15 July 2018 | |||||||||||||||||||||
Dates: |
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Volume: | 480 | |||||||||||||||||||||
Number: | 1 | |||||||||||||||||||||
Page Range: | L79-L84 | |||||||||||||||||||||
DOI: | 10.1093/mnrasl/sly124 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters following peer review. The version of record R Howe, W J Chaplin, G R Davies, Y Elsworth, S Basu, A-M Broomhall; Changes in the sensitivity of solar p-mode frequency shifts to activity over three solar cycles, Monthly Notices of the Royal Astronomical Society: Letters, Volume 480, Issue 1, 11 October 2018, Pages L79–L84, https://doi.org/10.1093/mnrasl/sly124 is available online at: https://doi.org/10.1093/mnrasl/sly124 | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Date of first compliant deposit: | 18 October 2018 | |||||||||||||||||||||
Date of first compliant Open Access: | 18 October 2018 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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