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Magnetohydrodynamic seismology of quiet solar active regions
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Anfinogentov, Sergey and Nakariakov, V. M. (Valery M.) (2019) Magnetohydrodynamic seismology of quiet solar active regions. Astrophysical Journal Letters, 884 . L40. doi:10.3847/2041-8213/ab4792 ISSN 2041-8213.
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WRAP-Magnetohydrodynamic-seismology-quiet-solar-Nakariakov-2019.pdf - Accepted Version - Requires a PDF viewer. Download (2384Kb) | Preview |
Official URL: https://doi.org/10.3847/2041-8213/ab4792
Abstract
The ubiquity of recently discovered low-amplitude decayless kink oscillations of plasma loops allows for the seismological probing of the corona on a regular basis. In particular, in contrast to traditionally applied seismology that is based on the large-amplitude decaying kink oscillations excited by flares and eruptions, decayless oscillations can potentially provide the diagnostics necessary for their forecasting. We analyzed decayless kink oscillations in several distinct loops belonging to active region NOAA 12107 on 2010 July 10 during its quiet time period, when it was observed on the west limb in extreme ultraviolet by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. The oscillation periods were estimated with the use of the motion magnification technique. The lengths of the oscillating loops were determined within the assumption of its semicircular shape by measuring the position of their footpoints. The density contrast in the loops was estimated from the observed intensity contrast accounting for the unknown spatial scale of the background plasma. The combination of those measurements allows us to determine the distribution of kink and Alfvén speeds in the active region. Thus, we demonstrate the possibility of obtaining seismological information about coronal active regions during the quiet periods of time.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Sun -- Corona , Magnetohydrodynamics , Solar oscillations | ||||||
Journal or Publication Title: | Astrophysical Journal Letters | ||||||
Publisher: | IOP Publishing Ltd | ||||||
ISSN: | 2041-8213 | ||||||
Official Date: | 15 October 2019 | ||||||
Dates: |
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Volume: | 884 | ||||||
Article Number: | L40 | ||||||
DOI: | 10.3847/2041-8213/ab4792 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Reuse Statement (publisher, data, author rights): | “This is an author-created, un-copyedited version of an article accepted for publication in Astrophysical Journal Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Date of first compliant deposit: | 27 September 2019 | ||||||
Date of first compliant Open Access: | 27 September 2019 | ||||||
RIOXX Funder/Project Grant: |
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