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Damping profile of standing kink oscillations observed by SDO/AIA
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Pascoe, D. J. (David J.), Goddard, Christopher R., Nisticò, Giuseppe, Anfinogentov, S. and Nakariakov, V. M. (Valery M.) (2016) Damping profile of standing kink oscillations observed by SDO/AIA. Astronomy and Astrophysics, 585 . pp. 1-5. L6. doi:10.1051/0004-6361/201527835 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/201527835
Abstract
Aims:
Strongly damped standing and propagating kink oscillations are observed in the solar corona. This can be understood in terms of mode coupling, which causes the wave energy to be converted from the bulk transverse oscillation to localised, unresolved azimuthal motions. The damping rate can provide information about the loop structure, and theory predicts two possible damping profiles.
Methods:
We used the recently compiled catalogue of decaying standing kink oscillations of coronal loops to search for examples with high spatial and temporal resolution and sufficient signal quality to allow the damping profile to be examined. The location of the loop axis was tracked, detrended, and fitted with sinusoidal oscillations with Gaussian and exponential damping profiles.
Results:
Using the highest quality data currently available, we find that for the majority of our cases a Gaussian profile describes the damping behaviour at least as well as an exponential profile, which is consistent with the recently developed theory for the damping profile due to mode coupling.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Sun -- Corona, Magnetohydrodynamics, Oscillations | ||||||||
Journal or Publication Title: | Astronomy and Astrophysics | ||||||||
Publisher: | EDP Sciences | ||||||||
ISSN: | 0004-6361 | ||||||||
Official Date: | 12 January 2016 | ||||||||
Dates: |
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Volume: | 585 | ||||||||
Number of Pages: | 5 | ||||||||
Page Range: | pp. 1-5 | ||||||||
Article Number: | L6 | ||||||||
DOI: | 10.1051/0004-6361/201527835 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Copyright Holders: | ESO | ||||||||
Date of first compliant deposit: | 31 March 2016 | ||||||||
Date of first compliant Open Access: | 1 April 2016 | ||||||||
Funder: | Marie Skłodowska-Curie actions, European Research Council (ERC), Science and Technology Facilities Council (Great Britain) (STFC) | ||||||||
Grant number: | PIRSES-GA- 2011-295272, 321141 (ERC), ST/L000733/1 (STFC) |
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