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Motion magnification in coronal seismology
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Anfinogentov, Sergey and Nakariakov, V. M. (Valery M.) (2016) Motion magnification in coronal seismology. Solar Physics, 291 (11). pp. 3251-3267. doi:10.1007/s11207-016-1013-z ISSN 0038-0938.
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Official URL: http://doi.org/10.1007/s11207-016-1013-z
Abstract
We introduce a new method for the investigation of low-amplitude transverse oscillations of solar plasma non-uniformities, such as coronal loops, individual strands in coronal arcades, jets, prominence fibrils, polar plumes, and other contrast features that have been observed with imaging instruments. The method is based on the two-dimensional dual-tree complex wavelet transform (DTℂWT). It allows us to magnify transverse, in the plane-of-the-sky, quasi-periodic motions of contrast features in image sequences. The tests performed on the artificial data cubes that imitated exponentially decaying, multi-periodic and frequency-modulated kink oscillations of coronal loops showed the effectiveness, reliability, and robustness of this technique. The algorithm was found to give linear scaling of the magnified amplitudes with the original amplitudes, provided these are sufficiently small. In addition, the magnification is independent of the oscillation period in a broad range of the periods. The application of this technique to SDO/AIA EUV data cubes of a non-flaring active region allowed for the improved detection of low-amplitude decay-less oscillations in the majority of loops.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Solar wind, Sun -- Loop prominences | ||||||
| Journal or Publication Title: | Solar Physics | ||||||
| Publisher: | Springer Netherlands | ||||||
| ISSN: | 0038-0938 | ||||||
| Official Date: | 15 November 2016 | ||||||
| Dates: |
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| Volume: | 291 | ||||||
| Number: | 11 | ||||||
| Page Range: | pp. 3251-3267 | ||||||
| DOI: | 10.1007/s11207-016-1013-z | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 8 November 2016 | ||||||
| Date of first compliant Open Access: | 15 November 2017 | ||||||
| Funder: | European Research Council (ERC) | ||||||
| Grant number: | Project No. 321141 SeismoSun |
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