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Dynamics of a multi-thermal loop in the solar corona
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Nisticò, Giuseppe, Anfinogentov, S. and Nakariakov, V. M. (Valery M.) (2014) Dynamics of a multi-thermal loop in the solar corona. Astronomy & Astrophysics, Volume 570 (Number 1). A84. ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/201423970
Abstract
Context. We present an observation of a long-living multi-thermal coronal loop, visible in different extreme ultra-violet wavebands of SDO/AIA in a quiet-Sun region close to the western solar limb.
Aims. Analysis of persistent kink displacements of the loop seen in different bandpasses that correspond to different temperatures of the plasma allows sub-resolution structuring of the loop to be revealed.
Methods. A vertically oriented slit is taken at the loop top, and time-distance maps are made from it. Loop displacements in time-distance maps are automatically tracked with the Gaussian fitting technique and fitted with a sinusoidal function that is “guessed”. Wavelet transforms are further used in order to quantify the periodicity variation in time of the kink oscillations.
Results. The loop strands are found to oscillate with the periods ranging between 3 and 15 min. The oscillations are observed in intermittent regime with temporal changes in the period and amplitude. The oscillations are different at three analysed wavelengths.
Conclusions. This finding suggests that the loop-like threads seen at different wavelengths are not co-spatial, hence that the loop consists of several multi-thermal strands. The detected irregularity of the oscillations can be associated with a stochastic driver acting at the footpoints of the loop.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Sun -- Corona, Astrophysics, Solar oscillations | ||||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||||
| Publisher: | EDP Sciences | ||||||||
| ISSN: | 0004-6361 | ||||||||
| Official Date: | 22 October 2014 | ||||||||
| Dates: |
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| Volume: | Volume 570 | ||||||||
| Number: | Number 1 | ||||||||
| Article Number: | A84 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Marie Curie Intra-European Fellowship (IEF), European Research Council (ERC), National Research Foundation of Korea (NRF), Russian Foundation for Basic Research (RFBR) | ||||||||
| Grant number: | ST/L000733/1, PIRSES -GA-2011-295272 , 321141, 13-02-00044 |
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