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

Detection of the second harmonic of decay-less kink oscillations in the solar corona

Tools
- Tools
+ Tools

Duckenfield, Timothy, Anfinogentov, Sergey, Pascoe, D. J. (David J.) and Nakariakov, V. M. (Valery M.) (2018) Detection of the second harmonic of decay-less kink oscillations in the solar corona. Astrophysical Journal Letters, 854 (1). L5. doi:10.3847/2041-8213/aaaaeb

[img]
Preview
PDF
WRAP-detection-second-harmonic-decay-less-oscillations-solar-Duckenfield-2018.pdf - Accepted Version - Requires a PDF viewer.

Download (1277Kb) | Preview
Official URL: https://doi.org/10.3847/2041-8213/aaaaeb

Request Changes to record.

Abstract

EUV observations of a multi-thermal coronal loop, taken by the Atmospheric Imaging Assembly of the Solar Dynamics Observatory, which exhibits decay-less kink oscillations are presented. The data cube of the quiet-Sun coronal loop was passed through a motion magnification algorithm to accentuate transverse oscillations. Time–distance maps are made from multiple slits evenly spaced along the loop axis and oriented orthogonal to the loop axis. Displacements of the intensity peak are tracked to generate time series of the loop displacement. Fourier analysis on the time series shows the presence of two periods within the loop: ${P}_{1}={10.3}_{-1.7}^{+1.5}$ minutes and ${P}_{2}={7.4}_{-1.3}^{+1.1}$ minutes. The longer period component is greatest in amplitude at the apex and remains in phase throughout the loop length. The shorter period component is strongest further down from the apex on both legs and displays an anti-phase behavior between the two loop legs. We interpret these results as the coexistence of the fundamental and second harmonics of the standing kink mode within the loop in the decay-less oscillation regime. An illustration of seismological application using the ratio P 1/2P 2 ~ 0.7 to estimate the density scale height is presented. The existence of multiple harmonics has implications for understanding the driving and damping mechanisms for decay-less oscillations and adds credence to their interpretation as standing kink mode oscillations.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Magnetohydrodynamics , Sun--Corona, Solar oscillations
Journal or Publication Title: Astrophysical Journal Letters
Publisher: IOP Publishing Ltd
ISSN: 2041-8213
Official Date: 7 February 2018
Dates:
DateEvent
7 February 2018Published
26 January 2018Accepted
Volume: 854
Number: 1
Article Number: L5
DOI: 10.3847/2041-8213/aaaaeb
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Science and Technology Facilities Council (Great Britain) (STFC)
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDBritish Councilhttp://dx.doi.org/10.13039/501100000308
UNSPECIFIEDKorea (South). Munʾgyobuhttps://viaf.org/viaf/132529252
UNSPECIFIEDScience and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271

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