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X-ray and EUV observations of simultaneous short and long period oscillations in hot coronal arcade loops

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Kumar, Pankaj, Nakariakov, V. M. and Cho, Kyung-Suk (2015) X-ray and EUV observations of simultaneous short and long period oscillations in hot coronal arcade loops. The Astrophysical Journal, 804 (1). pp. 1-14. 4. doi:10.1088/0004-637X/804/1/4

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Official URL: http://dx.doi.org/10.1088/0004-637X/804/1/4

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Abstract

We report decaying quasi-periodic intensity oscillations in the X-ray (6–12 keV) and extreme-ultraviolet (EUV) channels (131, 94, 1600, 304 Å) observed by the Fermi Gamma-ray Burst Monitor and Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), respectively, during a C-class flare. The estimated periods of oscillation and decay time in the X-ray channel (6–12 keV) were about 202 and 154 s, respectively. A similar oscillation period was detected at the footpoint of the arcade loops in the AIA 1600 and 304 Å channels. Simultaneously, AIA hot channels (94 and 131 Å) reveal propagating EUV disturbances bouncing back and forth between the footpoints of the arcade loops. The period of the oscillation and decay time were about 409 and 1121 s, respectively. The characteristic phase speed of the wave is about 560 km s−1 for about 115 Mm of loop length, which is roughly consistent with the sound speed at the temperature about 10–16 MK (480–608 km s−1). These EUV oscillations are consistent with the Solar and Heliospheric Observatory/Solar Ultraviolet Measurement of Emitted Radiation Doppler-shift oscillations interpreted as the global standing slow magnetoacoustic wave excited by a flare. The flare occurred at one of the footpoints of the arcade loops, where the magnetic topology was a 3D fan-spine with a null-point. Repetitive reconnection at this footpoint could have caused the periodic acceleration of non-thermal electrons that propagated to the opposite footpoint along the arcade and that are precipitating there, causing the observed 202 s periodicity. Other possible interpretations, e.g., the second harmonics of the slow mode, are also discussed.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Solar flares, Sun -- Loop prominences, Sunspots
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-637X
Official Date: 23 April 2015
Dates:
DateEvent
23 April 2015Published
20 February 2015Accepted
11 November 2014Submitted
Volume: 804
Number: 1
Number of Pages: 14
Page Range: pp. 1-14
Article Number: 4
DOI: 10.1088/0004-637X/804/1/4
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: United States. National Aeronautics and Space Administration (NASA), European Research Council (ERC), Science and Technology Facilities Council (Great Britain) (STFC), National Research Foundation of Korea (NRF)
Grant number: 321141 (ERC), ST/L000733/1 (STFC)

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