KELVIN-HELMHOLTZ INSTABILITY OF A CORONAL STREAMER

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳高能及相关物理过程研究团组

	KELVIN-HELMHOLTZ INSTABILITY OF A CORONAL STREAMER
	Feng, L.1,2 ; Inhester, B.2; Gan, W. Q.1
刊名	ASTROPHYSICAL JOURNAL
	2013-09-10
卷号	774 期号:2 页码:22PP
关键词	instabilities solar wind Sun: corona Sun: oscillations
ISSN号	0004-637X
通讯作者	Feng, L (reprint author), Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China. Email: lfeng@pmo.ac.cn
英文摘要	Shear-flow-driven instability can play an important role in energy transfer processes in coronal plasma. We present for the first time the observation of a kink-like oscillation of a streamer that is probably caused by the streaming kink-mode Kelvin-Helmholtz instability (KHI). The wave-like behavior of the streamer was observed by the Large Angle and Spectrometric Coronagraph Experiment C2 and C3 on board the SOlar and Heliospheric Observatory. The observed wave had a period of about 70-80 minutes, and its wavelength increased from 2 R-circle dot to 3 R-circle dot in about 1.5 hr. The phase speeds of its crests and troughs decreased from 406 +/- 20 to 356 +/- 31 km s(-1) during the event. Within the same heliocentric range, the wave amplitude also appeared to increase with time. We attribute the phenomena to the MHD KHI, which occurs at a neutral sheet in a fluid wake. The free energy driving the instability is supplied by the sheared flow and sheared magnetic field across the streamer plane. The plasma properties of the local environment of the streamer were estimated from the phase speed and instability threshold criteria.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SOLAR CORONA ; CURRENT SHEET ; EVOLUTION ; WAVES ; SIMULATIONS ; PLASMA ; BELT ; KINK ; JET
收录类别	SCI
语种	英语
WOS记录号	WOS:000323888900050
公开日期	2014-01-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/9865]
专题	紫金山天文台_太阳高能及相关物理过程研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China 2.Max Planck Inst Sonnensyst Forsch, D-37191 Katlenburg Lindau, Germany
推荐引用方式 GB/T 7714	Feng, L.,Inhester, B.,Gan, W. Q.. KELVIN-HELMHOLTZ INSTABILITY OF A CORONAL STREAMER[J]. ASTROPHYSICAL JOURNAL,2013,774(2):22PP.
APA	Feng, L.,Inhester, B.,&Gan, W. Q..(2013).KELVIN-HELMHOLTZ INSTABILITY OF A CORONAL STREAMER.ASTROPHYSICAL JOURNAL,774(2),22PP.
MLA	Feng, L.,et al."KELVIN-HELMHOLTZ INSTABILITY OF A CORONAL STREAMER".ASTROPHYSICAL JOURNAL 774.2(2013):22PP.