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Importance of Shock Compression in Enhancing ICME's Geoeffectiveness
Alternative TitleWOS:000516538200003
Xu, Mengjiao; Shen, Chenglong1; Wang, Yuming1,2; Luo, Bingxian3,4; Chi, Yutian
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2019
Volume884Issue:2Pages:L30
DOI10.3847/2041-8213/ab4717
ISSN2041-8205
Language英语
Keywordsolar-terrestrial relations Sun: coronal mass ejections (CMEs)-CORONAL MASS EJECTIONS INTER-PLANETARY SHOCK MAGNETIC CLOUDS INTERPLANETARY CMES HELIOSPHERE COLLISION MISSION STORMS
AbstractShock embedded interplanetary coronal mass ejections (ICMEs) are of great interest in the solar and heliosphere physics community due to their high potential to cause intense geomagnetic storms. In this work, 18 moderate to intense geomagnetic storms caused by shock-ICME complex structures are analyzed in order to show the importance of shock compression in enhancing ICMEs' geoeffectiveness. Based on the characteristics of the shocks inside ICMEs, including the shock velocity, shock normal direction, and the density compression ratio, we recover the shocked part in the ICME to the uncompressed state by using a recovery model developed by Wang et al. according to the Rankine-Hugoniot relationship. Comparing the observational data and the recovered parameters, we find that the maximum southward magnetic field in the ICME is doubled and the dawn-dusk electric field is increased 2.2 times due to the shock compression. Then, the parameters of the observed and recovered solar wind and magnetic field are, respectively, introduced into various Dst prediction models. The prediction results show that, on average, the shock compression can enhance the intensity of the geomagnetic storm by a factor of 1.4. Without shock compression, the geoeffectiveness of these ICMEs would be markedly reduced. Moreover, there is a significant correlation between the shock density compression ratio and the shock's capacity of strengthening geomagnetic storms. The larger the shock density compression ratio is, the more obvious Dst index decrease is caused.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7562
Collection中国科学院国家空间科学中心
Affiliation1.Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China
3.Univ Sci & Technol China, Sch Earth & Space Sci, Mengcheng Natl Geophys Observ, Hefei 230026, Peoples R China
4.Chinese Acad Sci, Natl Space Sci Ctr, 1 Nanertiao Zhongguancun Haidian Dist, Beijing 100190, Peoples R China
5.Univ Chinese Acad Sci, Sch Astron & Space Sci, Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Xu, Mengjiao,Shen, Chenglong,Wang, Yuming,et al. Importance of Shock Compression in Enhancing ICME's Geoeffectiveness[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,884(2):L30.
APA Xu, Mengjiao,Shen, Chenglong,Wang, Yuming,Luo, Bingxian,&Chi, Yutian.(2019).Importance of Shock Compression in Enhancing ICME's Geoeffectiveness.ASTROPHYSICAL JOURNAL LETTERS,884(2),L30.
MLA Xu, Mengjiao,et al."Importance of Shock Compression in Enhancing ICME's Geoeffectiveness".ASTROPHYSICAL JOURNAL LETTERS 884.2(2019):L30.
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