Large-amplitude Longitudinal Oscillations Triggered by the Merging of Two Solar Filaments: Observations and Magnetic Field Analysis

doi:10.3847/1538-4357/aa9713

	Large-amplitude Longitudinal Oscillations Triggered by the Merging of Two Solar Filaments: Observations and Magnetic Field Analysis
	Luna, M.1,2; Su, Y.3,4 ; Schmieder, B.5; Chandra, R.5,6; Kucera, T. A.7
刊名	ASTROPHYSICAL JOURNAL
	2017-12-01
卷号	850 期号:2 页码:13
关键词	Sun: filaments, prominences Sun: magnetic fields Sun: oscillations
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa9713
通讯作者	Luna, M.()
英文摘要	We follow the eruption of two related intermediate filaments observed in Ha (from GONG) and EUV (from Solar Dynamics Observatory SDO/Atmospheric Imaging assembly AIA) and the resulting large-amplitude longitudinal oscillations of the plasma in the filament channels. The events occurred in and around the decayed active region AR12486 on 2016 January 26. Our detailed study of the oscillation reveals that the periods of the oscillations are about one hour. In H alpha, the period decreases with time and exhibits strong damping. The analysis of 171 angstrom images shows that the oscillation has two phases: an initial long-period phase and a subsequent oscillation with a shorter period. In this wavelength, the damping appears weaker than in Ha. The velocity is the largest ever detected in a prominence oscillation, approximately 100 km s(-1). Using SDO/HMI magnetograms, we reconstruct the magnetic field of the filaments, modeled as flux ropes by using a flux-rope insertion method. Applying seismological techniques, we determine that the radii of curvature of the field lines in which cool plasma is condensed are in the range 75-120. Mm, in agreement with the reconstructed field. In addition, we infer a field strength of >= 7 to 30 Gauss, depending on the electron density assumed, that is also in agreement with the values from the reconstruction (8-20 Gauss). The poloidal flux is zero and the axis flux is on the order of 10(20) to 10(21) Mx, confirming the high shear existing even in a non-active filament.
WOS关键词	QUIESCENT PROMINENCE DYNAMICS ; PERIODIC MOTION ; MORETON WAVE ; POLAR CROWN ; HINODE ; FLOWS ; TRACE ; EUV ; SUN ; SDO
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000425485500002
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22289]
专题	中国科学院紫金山天文台
通讯作者	Luna, M.
作者单位	1.Inst Astrofis Canarias, E-38200 Tenerife, Spain 2.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain 3.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Jiangsu, Peoples R China 4.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China 5.CNRS, UMR8109, LESIA, Observ Paris, F-92195 Meudon, France 6.Kumaun Univ, Dept Phys, DSB Campus, Naini Tal, India 7.NASA, Goddard Space Flight Ctr, Code 671, Greenbelt, MD 20771 USA
推荐引用方式 GB/T 7714	Luna, M.,Su, Y.,Schmieder, B.,et al. Large-amplitude Longitudinal Oscillations Triggered by the Merging of Two Solar Filaments: Observations and Magnetic Field Analysis[J]. ASTROPHYSICAL JOURNAL,2017,850(2):13.
APA	Luna, M.,Su, Y.,Schmieder, B.,Chandra, R.,&Kucera, T. A..(2017).Large-amplitude Longitudinal Oscillations Triggered by the Merging of Two Solar Filaments: Observations and Magnetic Field Analysis.ASTROPHYSICAL JOURNAL,850(2),13.
MLA	Luna, M.,et al."Large-amplitude Longitudinal Oscillations Triggered by the Merging of Two Solar Filaments: Observations and Magnetic Field Analysis".ASTROPHYSICAL JOURNAL 850.2(2017):13.