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Multi-mode quasi-periodic pulsations in a solar flare
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Kolotkov, Dmitrii, Nakariakov, V. M., Kupriyanova, E. G., Ratcliffe, Heather and Shibasaki, K. (Kiyoto) (2015) Multi-mode quasi-periodic pulsations in a solar flare. Astronomy & Astrophysics, 574 . A53. doi:10.1051/0004-6361/201424988 ISSN 0004-6361.
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WRAP_9877890-px-140416-kolotkov_nakariakov_2column.pdf - Accepted Version - Requires a PDF viewer. Download (2269Kb) | Preview |
Official URL: http://dx.doi.org/10.1051/0004-6361/201424988
Abstract
Context.
Quasi-periodic pulsations (QPP) of the electromagnetic radiation emitted in solar and stellar flares are often detected in microwave, white light, X-ray, and gamma-ray bands. Mechanisms for QPP are intensively debated in the literature. Previous studies revealed that QPP may manifest non-linear, non-stationary and, perhaps, multi-modal processes operating in flares.
Aims.
We study QPP of the microwave emission generated in an X3.2-class solar flare on 14 May, 2013, observed with the Nobeyama Radioheliograph (NoRH), aiming to reveal signatures of the non-linear, non-stationary, and multi-modal processes in the signal.
Methods. The NoRH correlation signal obtained at the 17 GHz intensity has a clear QPP pattern. The signal was analysed with the Hilbert-Huang transform (HHT) that allows one to determine its instant amplitude and frequency, and their time variation.
Results.
It was established that the QPP consists of at least three well-defined intrinsic modes, with the mean periods of 15, 45, and 100 s. All the modes have quasi-harmonic behaviour with different modulation patterns. The 100 s intrinsic mode is a decaying oscillation, with the decay time of 250 s. The 15 s intrinsic mode shows a similar behaviour, with the decay time of 90 s. The 45 s mode has a wave-train behaviour.
Conclusions.
Dynamical properties of detected intrinsic modes indicate that the 100 s and 15 s modes are likely to be associated with fundamental kink and sausage modes of the flaring loop, respectively. The 100 s oscillation could also be caused by the fundamental longitudinal mode, while this interpretation requires the plasma temperature of about 30 million K and hence is not likely. The 45 s mode could be the second standing harmonics of the kink mode.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Magnetohydrodynamics, Solar oscillations, Solar flares, Sun -- Corona | ||||||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||||||
Publisher: | EDP Sciences | ||||||||
ISSN: | 0004-6361 | ||||||||
Official Date: | February 2015 | ||||||||
Dates: |
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Volume: | 574 | ||||||||
Number of Pages: | 6 | ||||||||
Article Number: | A53 | ||||||||
DOI: | 10.1051/0004-6361/201424988 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 25 April 2016 | ||||||||
Date of first compliant Open Access: | 26 April 2016 | ||||||||
Funder: | European Research Council (ERC), Royal Society (Great Britain), Science and Technology Facilities Council (Great Britain) (STFC), National Research Foundation of Korea (NRF), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR) | ||||||||
Grant number: | PIRSES-GA- 2011-295272, 321141 (ERC), ST/L000733/1 (STFC), 12-02-00616 (RFBR), 14-02-00924 (RFBR), 13-02-00044 (RFBR) |
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