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KELVIN-HELMHOLTZ INSTABILITY OF A CORONAL STREAMER
Feng, L.1,2; Inhester, B.2; Gan, W. Q.1
2013-09-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume774Issue:2Pages:22PP
Corresponding AuthorFeng, 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
AbstractShear-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.
KeywordInstabilities Solar Wind Sun: Corona Sun: Oscillations
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/774/2/141
WOS KeywordSOLAR CORONA ; CURRENT SHEET ; EVOLUTION ; WAVES ; SIMULATIONS ; PLASMA ; BELT ; KINK ; JET
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000323888900050
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9865
Collection太阳高能及相关物理过程研究团组
Affiliation1.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
Recommended Citation
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.
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