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Standing kink waves in sigmoid coronal loops : implications for coronal seismology
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Magyar, Norbert and Nakariakov, V. M. (Valery M.) (2020) Standing kink waves in sigmoid coronal loops : implications for coronal seismology. The Astrophysical Journal Letters, 894 (2). L23. doi:10.3847/2041-8213/ab8e36 ISSN 2041-8205.
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Official URL: https://doi.org/10.3847/2041-8213/ab8e36
Abstract
Using full three-dimensional magnetohydrodynamic numerical simulations, we study the effects of magnetic field sigmoidity or helicity on the properties of the fundamental kink oscillation of solar coronal loops. Our model consists of a single denser coronal loop, embedded in a plasma with dipolar force-free magnetic field with a constant α-parameter. For the loop with no sigmoidity, we find that the numerically determined oscillation period of the fundamental kink mode matches the theoretical period calculated using WKB theory. In contrast, with
increasing sigmoidity of the loop, the actual period is increasingly smaller than the one estimated by WKB theory. Translated through coronal seismology, increasing sigmoidity results in magnetic field estimates that are increasingly shifting toward higher values, and even surpassing the average value for the highest α value considered. Nevertheless, the estimated range of the coronal magnetic field value lies within the minimal/maximal limits, proving the robustness coronal seismology. We propose that the discrepancy in the estimations of the
absolute value of the force-free magnetic field could be exploited seismologically to determine the free energy of coronal loops, if averages of the internal magnetic field and density can be reliably estimated by other methods.
| Item Type: | Journal Article | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Magnetohydrodynamics, Sun -- Corona, Astrophysics | |||||||||
| Journal or Publication Title: | The Astrophysical Journal Letters | |||||||||
| Publisher: | Institute of Physics Publishing, Inc. | |||||||||
| ISSN: | 2041-8205 | |||||||||
| Official Date: | 13 May 2020 | |||||||||
| Dates: |
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| Volume: | 894 | |||||||||
| Number: | 2 | |||||||||
| Article Number: | L23 | |||||||||
| DOI: | 10.3847/2041-8213/ab8e36 | |||||||||
| 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 The Astrophysical Journal Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.3847/2041-8213/ab8e36 | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| Date of first compliant deposit: | 11 May 2020 | |||||||||
| Date of first compliant Open Access: | 12 May 2020 | |||||||||
| RIOXX Funder/Project Grant: |
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