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Oscillation of a small Hα surge in a solar polar coronal hole
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Cho, Kyung-Suk, Cho, Il-Hyun, Nakariakov, V. M. (Valery M.), Yurchyshyn, Vasyl B., Yang, Heesu, Kim, Yeon-Han, Kumar, Pankaj and Magara, Tetsuya (2019) Oscillation of a small Hα surge in a solar polar coronal hole. Astrophysical Journal Letters, 877 (1). L1. doi:10.3847/2041-8213/ab1eb5 ISSN 2041-8213.
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WRAP-Oscillation-small-sSurge-solar-polar-coronal-hole-Nakariakov-2019.pdf - Accepted Version - Requires a PDF viewer. Download (3906Kb) | Preview |
Official URL: https://doi.org/10.3847/2041-8213/ab1eb5
Abstract
Hα surges (i.e. cool/dense collimated plasma ejections) may act as a guide for a propagation of magnetohydrodynamic waves. We report a high-resolution observation of a surge observed with 1.6 m Goode Solar Telescope (GST) on 2009 August 26, from 18:20 UT to 18:45 UT. Characteristics of plasma motions in the surge are determined with the normalizing radial gradient filter and the Fourier motion filter. The shape of the surge is found to change from a ‘C’ shape to an inverse ‘C’ shape after a formation of a cusp, a signature of reconnection. There are apparent upflows seen above the cusp top and downflows below it. The upflows show rising and rotational motions in the right-hand direction, with the rotational speed decreasing with height. Near the cusp top, we find a transverse oscillation of the surge, with the period of∼2 min. There is no change of the oscillation phase below the cusp top, but above the top a phase change is identified, giving a vertical phase speed about 86 km s−1. As the height increases, the initial amplitude of the oscillation increases, and the oscillation damping time decreases from 5.13 to 1.18 min. We conclude that the oscillation is a propagating kink wave that is possibly excited by the repetitive spontaneous magnetic reconnection.
| 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): | Solar wind, Magnetohydrodynamic waves | |||||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Astrophysical Journal Letters | |||||||||||||||||||||||||||||||||||||||||||||
| Publisher: | IOP Publishing Ltd | |||||||||||||||||||||||||||||||||||||||||||||
| ISSN: | 2041-8213 | |||||||||||||||||||||||||||||||||||||||||||||
| Official Date: | 15 May 2019 | |||||||||||||||||||||||||||||||||||||||||||||
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| Volume: | 877 | |||||||||||||||||||||||||||||||||||||||||||||
| Number: | 1 | |||||||||||||||||||||||||||||||||||||||||||||
| Article Number: | L1 | |||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.3847/2041-8213/ab1eb5 | |||||||||||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||||||||||||||||||||
| Copyright Holders: | American Astronomical Society 2019 | |||||||||||||||||||||||||||||||||||||||||||||
| Date of first compliant deposit: | 3 May 2019 | |||||||||||||||||||||||||||||||||||||||||||||
| Date of first compliant Open Access: | 3 May 2019 | |||||||||||||||||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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