Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

A helioseismic perspective on the depth of the minimum between solar cycles 23 and 24

Tools
- Tools
+ Tools

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

[img]
Preview
PDF
WRAP-helioseismic-depth-minimum-solar-Broomhall-2017.pdf - Published Version - Requires a PDF viewer.
Available under License Creative Commons Attribution 4.0.

Download (1435Kb) | Preview
Official URL: http://doi.org/10.1007/s11207-017-1068-5

Request Changes to record.

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
Subjects: Q Science > QB Astronomy
Divisions: Other > Institute of Advanced Study
Faculty of Science > Physics
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:
DateEvent
10 April 2017Published
27 February 2017Accepted
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:
  • ArXiv

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us