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First Determination of 2D Speed Distribution within the Bodies of Coronal Mass Ejections with Cross-correlation Analysis
Ying, Beili1,2; Bemporad, Alessandro3; Giordano, Silvio3; Pagano, Paolo4; Feng, Li1,2; Lu, Lei1,2; Li, Hui1,2; Gan, Weiqun1,2
2019-07-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume880Issue:1Pages:14
Corresponding AuthorYing, Beili(yingbl@pmo.ac.cn) ; Feng, Li(lfeng@pmo.ac.cn)
AbstractThe determination of the speed of coronal mass ejections (CMEs) is usually done by tracking brighter features (such as the CME front and core) in visible light (VL) coronagraphic images and by deriving unidimensional profiles of the CME speed as a function of altitude or time. Nevertheless, CMEs are usually characterized by the presence of significant density inhomogeneities propagating outward with different radial and latitudinal projected speeds, resulting in a complex evolution eventually forming the interplanetary CME. In this work, we demonstrate for the first time how coronagraphic image sequences can be analyzed with the cross-correlation technique to derive two-dimensional (2D) maps of the almost instantaneous plasma speed distribution within the body of CMEs. The technique is first tested with the analysis of synthetic data and then applied to real observations. Results from this work allow us to characterize the distribution and time evolution of kinetic energy inside CMEs, as well as the mechanical energy (combined with the kinetic and potential energy) partition between the core and front of the CME. In the future, CMEs will be observed by two channels (VL and UV Ly alpha) coronagraphs, such as Metis on board ESA Solar Orbiter mission as well as the Ly alpha Solar Telescope on board the Chinese Advanced Space-based Solar Observatory mission. Our results will help in the analysis of these future observations, helping in particular to take into account the 2D distribution of Ly alpha Doppler dimming effect.
Keywordmagnetohydrodynamics (MHD) methods: data analysis Sun: coronal mass ejections (CMEs) Sun: UV radiation techniques: polarimetric
DOI10.3847/1538-4357/ab2713
WOS KeywordULTRAVIOLET-SPECTRA ; ENERGY PARTITION ; FLARE EMISSIONS ; VELOCITY-FIELD ; SOLAR ; STEREO ; ENERGETICS ; EVOLUTION ; CMES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000476896700006
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27177
Collection中国科学院紫金山天文台
Corresponding AuthorYing, Beili; Feng, Li
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210032, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.INAF, Turin Astrophys Observ, Via Osservatorio 20, I-10025 Pino Torinese, TO, Italy
4.Univ St Andrews, Sch Math & Stat, St Andrews KY16 9SS, Fife, Scotland
Recommended Citation
GB/T 7714
Ying, Beili,Bemporad, Alessandro,Giordano, Silvio,et al. First Determination of 2D Speed Distribution within the Bodies of Coronal Mass Ejections with Cross-correlation Analysis[J]. ASTROPHYSICAL JOURNAL,2019,880(1):14.
APA Ying, Beili.,Bemporad, Alessandro.,Giordano, Silvio.,Pagano, Paolo.,Feng, Li.,...&Gan, Weiqun.(2019).First Determination of 2D Speed Distribution within the Bodies of Coronal Mass Ejections with Cross-correlation Analysis.ASTROPHYSICAL JOURNAL,880(1),14.
MLA Ying, Beili,et al."First Determination of 2D Speed Distribution within the Bodies of Coronal Mass Ejections with Cross-correlation Analysis".ASTROPHYSICAL JOURNAL 880.1(2019):14.
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