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Decayless low-amplitude kink oscillations : a common phenomenon in the solar corona?

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Anfinogentov, Sergey, Nakariakov, V. M. and Nisticò, Giuseppe (2015) Decayless low-amplitude kink oscillations : a common phenomenon in the solar corona? Astronomy & Astrophysics, 583 . A136. doi:10.1051/0004-6361/201526195

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Official URL: http://dx.doi.org/10.1051/0004-6361/201526195

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Abstract

Context. We investigate the decayless regime of coronal kink oscillations recently discovered in the Solar Dynamics Observatory (SDO)/AIA data. In contrast to decaying kink oscillations that are excited by impulsive dynamical processes, this type of transverse oscillations is not connected to any external impulsive impact, such as a flare or coronal mass ejection, and does not show any significant decay. Moreover the amplitude of these decayless oscillations is typically lower than that of decaying oscillations.
Aims. The aim of this research is to estimate the prevalence of this phenomenon and its characteristic signatures.
Methods. We analysed 21 active regions (NOAA 11637–11657) observed in January 2013 in the 171 Å channel of SDO/AIA. For each active region we inspected six hours of observations, constructing time-distance plots for the slits positioned across pronounced bright loops. The oscillatory patterns in time-distance plots were visually identified and the oscillation periods and amplitudes were measured. We also estimated the length of each oscillating loop.
Results. Low-amplitude decayless kink oscillations are found to be present in the majority of the analysed active regions. The oscillation periods lie in the range from 1.5 to 10 min. In two active regions with insufficient observation conditions we did not identify any oscillation patterns. The oscillation periods are found to increase with the length of the oscillating loop.
Conclusions. The considered type of coronal oscillations is a common phenomenon in the corona. The established dependence of the oscillation period on the loop length is consistent with their interpretation in terms of standing kink waves.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Sun -- Corona, Astrophysics
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: 5 November 2015
Dates:
DateEvent
5 November 2015Published
18 August 2015Accepted
27 March 2015Submitted
Date of first compliant deposit: 22 April 2016
Volume: 583
Page Range: A136
DOI: 10.1051/0004-6361/201526195
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: European Research Council (ERC), Russian Foundation for Basic Research (RFBR)
Grant number: 321141, 13-02-00044-a, 15-02-01089-a, 15-02-03835-a, 15-32-20504 mol_a_ved,

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