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Spatially resolved observation of the fundamental and second harmonic standing kink modes using SDO/AIA
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Pascoe, D. J. (David J.), Goddard, Christopher R. and Nakariakov, V. M. (Valery M.) (2016) Spatially resolved observation of the fundamental and second harmonic standing kink modes using SDO/AIA. Astronomy & Astrophysics, 593 . pp. 1-10. A53. doi:10.1051/0004-6361/201628784
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Official URL: https://doi.org/10.1051/0004-6361/201628784
Abstract
We consider a coronal loop kink oscillation observed by the atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO) which demonstrates two strong spectral components. The period of the lower frequency component being approximately twice that of the shorter frequency component suggests the presence of harmonics.
Methods. We examine the presence of two longitudinal harmonics by investigating the spatial dependence of the loop oscillation. The time-dependent displacement of the loop is measured at 15 locations along the loop axis. For each position the detrended displacement is fitted as the sum of two damped sinusoids, having periods P1 and P2, and a damping time τ. The shorter period component exhibits anti-phase oscillations in the loop legs.
Results. We interpret the observation in terms of the first (global or fundamental) and second longitudinal harmonics of the standing kink mode. The strong excitation of the second harmonic appears connected to the preceding coronal mass ejection (CME) which displaced one of the loop legs. The oscillation parameters found are P1 “ 5.00 ˘ 0.62 minutes, P2 “ 2.20 ˘ 0.23 minutes, P1{2P2 “ 1.15 ˘ 0.22, and τ{P “ 3.35 ˘ 1.45.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||
| Divisions: | Faculty of Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Magnetohydrodynamics, Sun -- Corona -- Magnetic fields, Solar oscillations | ||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||
| Publisher: | EDP Sciences | ||||||
| ISSN: | 0004-6361 | ||||||
| Official Date: | 21 September 2016 | ||||||
| Dates: |
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| Volume: | 593 | ||||||
| Number of Pages: | 10 | ||||||
| Page Range: | pp. 1-10 | ||||||
| Article Number: | A53 | ||||||
| DOI: | 10.1051/0004-6361/201628784 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access | ||||||
| Funder: | Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC), Science and Technology Facilities Council (Great Britain) (STFC) | ||||||
| Grant number: | 295272 (FP7), 321141 (ERC), ST/L000733/1 (STFC) |
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