A Research on the Physical Features of Coronal Loop Oscillations |
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| Authors: | Zhang Zhen He XinLiang Hong-fei |
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| Institution: | College of Physics and Electronic Information, Yunnan Normal University, Kunming 650092 |
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| Abstract: | Observations of the solar full-disk were carried out by the Atmo- spheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) with the Fe IX 171 Å line on 16th October 2010. The obtained high-quality data permit us to elaborate on the coronal loop oscillations. It is found that a major flare of GOES (Geostationary Operational Environmental Satellite) class M2.9 occurred in the active region NOAA 1112 during this period, which triggered a number of coronal loops on the solar surface to oscillate. Among them, there are two coronal loops exhibiting oscillations with different physical features. The oscillation of the coronal loop located at W492/S170 is a simple harmonic oscillation with a period of 385s, which abides by the oscillating equation of x = 2.2 sin2π/385(t–768)], while the other located at W559/S142 is a damping oscillation with a period of 449s, and the oscillating equation is expressed by x = 24.8e - 2π/343 t sin2π/449(t–1128)], where t is the observational time in units of second. |
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| Keywords: | sun: oscillations&ndash sun: flares&ndash sun: corona |
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