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Characteristics and Importance of ICME-in-sheath Phenomenon and Upper Limit for Geomagnetic Storm Activity
Alternative TitleWOS:000548369900001
Liu, Ying D.; Chen, Chong; Zhao, Xiaowei2,5
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2020
Volume897Issue:1Pages:L11
DOI10.3847/2041-8213/ab9d25
ISSN2041-8205
Language英语
KeywordShocks Solar-terrestrial interactions Solar wind Solar coronal mass ejections CORONAL MASS EJECTIONS SOLAR-WIND MAGNETIC CLOUDS FIELD CMES SIMULATION KINEMATICS MAXIMUM PLASMA SHOCKS
AbstractAs an important source for large geomagnetic storms, an ICME-in-sheath is a completely shocked interplanetary coronal mass ejection (ICME) stuck in the sheath between a shock and host ejecta. Typical characteristics are identified from coordinated multi-sets of observations: (1) it is usually short in duration and lasts a few hours at 1 au; (2) its solar wind parameters, in particular the magnetic field, seem to keep enhanced for a large range of distances; and (3) common ICME signatures are often lost. The host ejecta could be a single ICME or a complex ejecta, being fast enough to drive a shock. These results clarify previous misinterpretations of this phenomenon as a normal part of a sheath region. The ICME-in-sheath phenomenon, together with a preconditioning effect, produced an extreme set of the magnetic field, speed, and density near 1 au in the 2012 July 23 case, all around their upper limits at the same time. This is probably the most extreme solar wind driving at 1 au and enables us to estimate the plausible upper limit for geomagnetic storm activity. With an appropriate modification in the southward field, we suggest that a geomagnetic storm with a minimumD(st)of about -2000 nT could occur in principle. The magnetopause would be compressed to about 3.3 Earth radii from the Earth's center, well inside the geosynchronous orbit.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7518
Collection中国科学院国家空间科学中心
Affiliation1.[Liu, Ying D.
2.Chen, Chong
3.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
4.[Liu, Ying D.
5.Chen, Chong
6.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Liu, Ying D.,Chen, Chong,Zhao, Xiaowei. Characteristics and Importance of ICME-in-sheath Phenomenon and Upper Limit for Geomagnetic Storm Activity[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,897(1):L11.
APA Liu, Ying D.,Chen, Chong,&Zhao, Xiaowei.(2020).Characteristics and Importance of ICME-in-sheath Phenomenon and Upper Limit for Geomagnetic Storm Activity.ASTROPHYSICAL JOURNAL LETTERS,897(1),L11.
MLA Liu, Ying D.,et al."Characteristics and Importance of ICME-in-sheath Phenomenon and Upper Limit for Geomagnetic Storm Activity".ASTROPHYSICAL JOURNAL LETTERS 897.1(2020):L11.
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