Non-damping oscillations at flaring loops

doi:10.1051/0004-6361/201832991

CORC > 国家天文台 > 中国科学院国家天文台

	Non-damping oscillations at flaring loops
	Li, D.1,2,3; Yuan, D.4; Su, Y. N.1,5; Zhang, Q. M.1,3; Su, W.6; Ning, Z. J.1,5
刊名	ASTRONOMY & ASTROPHYSICS
	2018-09-25
卷号	617 页码:9
关键词	Sun: flares Sun: oscillations Sun: UV radiation Sun: X-rays, gamma rays line: profiles techniques: spectroscopic
ISSN号	1432-0746
DOI	10.1051/0004-6361/201832991
英文摘要	Context. Quasi-periodic oscillations are usually detected as spatial displacements of coronal loops in imaging observations or as periodic shifts of line properties (i.e., Doppler velocity, line width and intensity) in spectroscopic observations. They are often applied for remote diagnostics of magnetic fields and plasma properties on the Sun. Aims. We combine the imaging and spectroscopic measurements of available space missions, and investigate the properties of non-damping oscillations at flaring loops. Methods. We used the Interface Region Imaging Spectrograph (IRIS) to measure the spectrum over a narrow slit. The double-component Gaussian fitting method was used to extract the line profile of Fe xxi 1354.08 angstrom at the "OI" spectral window. The quasi-periodicity of loop oscillations were identified in the Fourier and wavelet spectra. Results. A periodicity at about 40 s is detected in the line properties of Fe xxi 1354.08 angstrom, hard X-ray emissions in GOES 1-8 angstrom derivative, and Fermi 26-50 keV. The Doppler velocity and line width oscillate in phase, while a phase shift of about pi/2 is detected between the Doppler velocity and peak intensity. The amplitudes of Doppler velocity and line width oscillation are about 2.2 km s(-1) and 1.9 km s(-1), respectively, while peak intensity oscillates with amplitude at about 3.6% of the background emission. Meanwhile, a quasi-period of about 155 s is identified in the Doppler velocity and peak intensity of the Fe xxi 1354.08 angstrom line emission, and AIA 131 angstrom intensity. Conclusions. The oscillations at about 40 s are not damped significantly during the observation; this might be linked to the global kink modes of flaring loops. The periodicity at about 155 s is most likely a signature of recurring downflows after chromospheric evaporation along flaring loops. The magnetic field strengths of the flaring loops are estimated to be about 120-170 G using the magnetohydrodynamic seismology diagnostics, which are consistent with the magnetic field modeling results using the flux rope insertion method.
资助项目	NSFC[11603077] ; NSFC[11573072] ; NSFC[11773079] ; NSFC[11790300] ; NSFC[11729301] ; NSFC[11790302] ; NSFC[11473071] ; NSFC[11333009] ; CRP[KLSA201708] ; Youth Fund of Jiangsu[BK20161095] ; Youth Fund of Jiangsu[BK20171108] ; National Natural Science Foundation of China[U1731241] ; Strategic Priority Research Program on Space Science, CAS[XDA15052200] ; Strategic Priority Research Program on Space Science, CAS[XDA15320301] ; Specialized Research Fund for State Key Laboratories ; CAS[2010DP173032] ; ISSI-BJ
WOS关键词	QUASI-PERIODIC PULSATIONS ; REGION-IMAGING-SPECTROGRAPH ; DOPPLER-SHIFT OSCILLATIONS ; X-RAY-EMISSION ; SOLAR-FLARE ; CORONAL LOOPS ; TRANSVERSE OSCILLATIONS ; TRANSITION-REGION ; MAGNETIC-FIELDS ; ACTIVE-REGION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000445446100001
资助机构	NSFC ; NSFC ; CRP ; CRP ; Youth Fund of Jiangsu ; Youth Fund of Jiangsu ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; CAS ; CAS ; ISSI-BJ ; ISSI-BJ ; NSFC ; NSFC ; CRP ; CRP ; Youth Fund of Jiangsu ; Youth Fund of Jiangsu ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; CAS ; CAS ; ISSI-BJ ; ISSI-BJ ; NSFC ; NSFC ; CRP ; CRP ; Youth Fund of Jiangsu ; Youth Fund of Jiangsu ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; CAS ; CAS ; ISSI-BJ ; ISSI-BJ ; NSFC ; NSFC ; CRP ; CRP ; Youth Fund of Jiangsu ; Youth Fund of Jiangsu ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; CAS ; CAS ; ISSI-BJ ; ISSI-BJ
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/22737]
专题	中国科学院国家天文台
通讯作者	Li, D.
作者单位	1.Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China 2.Chinese Acad Sci, Sate Key Lab Space Weather, Beijing 100190, Peoples R China 3.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China 4.Harbin Inst Technol, Inst Space Sci & Appl Technol, Shenzhen Campus, Shenzhen 518055, Peoples R China 5.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China 6.Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Phys Quant Measurements, Wuhan 430074, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Li, D.,Yuan, D.,Su, Y. N.,et al. Non-damping oscillations at flaring loops[J]. ASTRONOMY & ASTROPHYSICS,2018,617:9.
APA	Li, D.,Yuan, D.,Su, Y. N.,Zhang, Q. M.,Su, W.,&Ning, Z. J..(2018).Non-damping oscillations at flaring loops.ASTRONOMY & ASTROPHYSICS,617,9.
MLA	Li, D.,et al."Non-damping oscillations at flaring loops".ASTRONOMY & ASTROPHYSICS 617(2018):9.