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WHY DOES THE APPARENT MASS OF A CORONAL MASS EJECTION INCREASE?
Feng, Li1,2; Wang, Yuming3; Shen, Fang4; Shen, Chenglong3; Inhester, Bernd2; Lu, Lei1; Gan, Weiqun1
2015-10-10
Source PublicationASTROPHYSICAL JOURNAL
Volume812Issue:1Pages:70-81
AbstractMass 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.
KeywordSun: Corona Sun: Coronal Mass Ejections (Cmes) Solar Wind
Subject Area天体物理学
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/812/1/70
WOS KeywordLARGE-ANGLE ; STEREO ; SIMULATIONS ; EVOLUTION ; ENERGY ; EARTH ; LOCALIZATION ; PROPAGATION ; VIEWPOINTS ; SPACE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000364234700070
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15209
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, 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
Recommended Citation
GB/T 7714
Feng, Li,Wang, Yuming,Shen, Fang,et al. WHY DOES THE APPARENT MASS OF A CORONAL MASS EJECTION INCREASE?[J]. ASTROPHYSICAL JOURNAL,2015,812(1):70-81.
APA Feng, Li.,Wang, Yuming.,Shen, Fang.,Shen, Chenglong.,Inhester, Bernd.,...&Gan, Weiqun.(2015).WHY DOES THE APPARENT MASS OF A CORONAL MASS EJECTION INCREASE?.ASTROPHYSICAL JOURNAL,812(1),70-81.
MLA Feng, Li,et al."WHY DOES THE APPARENT MASS OF A CORONAL MASS EJECTION INCREASE?".ASTROPHYSICAL JOURNAL 812.1(2015):70-81.
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