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题名: WHY DOES THE APPARENT MASS OF A CORONAL MASS EJECTION INCREASE?
作者: Feng Li(封莉)1, 2; Wang, Yuming3; Shen, Fang4; Shen, Chenglong3; Inhester, Bernd2; Lu, Lei1; Gan WeiQun(甘伟群)1
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-10-10
卷号: 812, 期号:1, 页码:70-81
关键词: Sun: corona ; Sun: coronal mass ejections (CMEs) ; solar wind
学科分类: 天体物理学
DOI: 10.1088/0004-637X/812/1/70
文章类型: Article
英文摘要: Mass is one of the most fundamental parameters characterizing the dynamics of a coronal mass ejection (CME). It has been found that CME apparent mass measured from the brightness enhancement in coronagraphs increases during its evolution in the corona. However, the physics behind it is not clear. Does the apparent mass gain come from the outflow from the dimming regions in the low corona, or from the pileup of the solar wind plasma around the CME? Here we analyze the mass evolution of six CME events. Based on the coronagraph observations from the Solar Terrestrial Relations Observatory, we find that their masses increased by a factor of 1.3-1.7 from 7 to 15 R-S, where the occulting effect is negligible. We then adopt the "snow-plow" model to calculate the mass contribution of the piled-up solar wind. The result gives evidence that the solar wind pileup probably makes a non-negligible contribution to the mass increase. In the height range from about 7 to 15 R-S, the ratio of the modeled to the measured mass increase is roughly larger than 0.55 though the ratios are believed to be overestimated. It is not clear yet whether the solar wind pileup is a major contributor to the final mass derived from coronagraph observations, but it does play an increasingly important role in the mass increase as a CME moves further away from the Sun.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: LARGE-ANGLE ; STEREO ; SIMULATIONS ; EVOLUTION ; ENERGY ; EARTH ; LOCALIZATION ; PROPAGATION ; VIEWPOINTS ; SPACE
收录类别: SCI
项目资助者: MOSTC(2011CB811402 ; NSFC(11522328 ; NSF of Jiangsu Province(BK2012889) ; CAS(XDA04076101 ; Youth Innovation Promotion Association, CAS ; DLR contract(50 OC 1301) ; 2011CB811403 ; 11473070 ; KZZD-EW-01-4) ; 2012CB825601) ; 11427803 ; 11233008 ; 11273065 ; 41131065 ; 41574165 ; 41121003 ; 41274173 ; 41174150 ; 41474152)
语种: 英语
WOS记录号: WOS:000364234700070
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15209
Appears in Collections:太阳高能及相关物理过程研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing, Jiangsu, Peoples R China
2.Max Planck Inst Sonnensyst Forsch, Gottingen, Lower Saxony, Germany
3.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
4.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
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