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NON-EQUILIBRIUM IONIZATION MODELING OF THE CURRENT SHEET IN A SIMULATED SOLAR ERUPTION
Shen CC(沈呈彩)1,2,3; Reeves, KK1; Raymond, JC1; Murphy, NA1; Ko, YK4; Lin J(林隽)2; Mikic, Z5; Linker, JA5; Shen, CC (reprint author), Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.
发表期刊ASTROPHYSICAL JOURNAL
2013-08-20
卷号773期号:2
DOI10.1088/0004-637X/773/2/110
产权排序第2完成单位
收录类别SCI
关键词Atomic Processes Magnetic Reconnection Sun: Coronal Mass Ejections (Cmes) Sun: Uv Radiation
摘要The current sheet that extends from the top of flare loops and connects to an associated flux rope is a common structure in models of coronal mass ejections (CMEs). To understand the observational properties of CME current sheets, we generated predictions from a flare/CME model to be compared with observations. We use a simulation of a large-scale CME current sheet previously reported by Reeves et al. This simulation includes ohmic and coronal heating, thermal conduction, and radiative cooling in the energy equation. Using the results of this simulation, we perform time-dependent ionization calculations of the flow in a CME current sheet and construct two-dimensional spatial distributions of ionic charge states for multiple chemical elements. We use the filter responses from the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory and the predicted intensities of emission lines to compute the count rates for each of the AIA bands. The results show differences in the emission line intensities between equilibrium and non-equilibrium ionization. The current sheet plasma is underionized at low heights and overionized at large heights. At low heights in the current sheet, the intensities of the AIA 94 angstrom and 131 angstrom channels are lower for non-equilibrium ionization than for equilibrium ionization. At large heights, these intensities are higher for non-equilibrium ionization than for equilibrium ionization inside the current sheet. The assumption of ionization equilibrium would lead to a significant underestimate of the temperature low in the current sheet and overestimate at larger heights. We also calculate the intensities of ultraviolet lines and predict emission features to be compared with events from the Ultraviolet Coronagraph Spectrometer on the Solar and Heliospheric Observatory, including a low-intensity region around the current sheet corresponding to this model.
项目资助者NASA [NNX11AB61G, NNH11AQ13I] ; NSF SHINE [AGS-1156076] ; Program 973 [2011CB811403, 2013CBA01503] ; NSFC [11273055] ; CAS [KJCX2-EW-T07] ; NASA (Heliophysics theory program) ; NSF (Frontiers in Earth System Dynamics)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000323426100029
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL MASS EJECTION ; MAGNETIC RECONNECTION ; ULTRAVIOLET-SPECTRA ; SOHO OBSERVATIONS ; CHARGE STATES ; PLASMA ; FLARES ; EVOLUTION ; FEATURES ; SPECTROMETER
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被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6224
专题太阳物理研究组
通讯作者Shen, CC (reprint author), Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.
作者单位1.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
2.Yunnan Astronomical Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan 650011, China
3.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
4.Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA
5.Predictive Science, Inc. (PSI), San Diego, CA 92121-2910, USA
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Shen CC,Reeves, KK,Raymond, JC,et al. NON-EQUILIBRIUM IONIZATION MODELING OF THE CURRENT SHEET IN A SIMULATED SOLAR ERUPTION[J]. ASTROPHYSICAL JOURNAL,2013,773(2).
APA Shen CC.,Reeves, KK.,Raymond, JC.,Murphy, NA.,Ko, YK.,...&Shen, CC .(2013).NON-EQUILIBRIUM IONIZATION MODELING OF THE CURRENT SHEET IN A SIMULATED SOLAR ERUPTION.ASTROPHYSICAL JOURNAL,773(2).
MLA Shen CC,et al."NON-EQUILIBRIUM IONIZATION MODELING OF THE CURRENT SHEET IN A SIMULATED SOLAR ERUPTION".ASTROPHYSICAL JOURNAL 773.2(2013).
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