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Numerical Study of Erosion, Heating, and Acceleration of the Magnetic Cloud as Impacted by Fast Shock
Mao, Shoudi; He, Jiansen; Zhang, Lei; Yang, Liping; Wang, Linghua; He, JS (reprint author), Peking Univ, Sch Earth & Space Sci, 5 Yiheyuan Rd, Beijing 100871, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2017
Volume842Issue:2Pages:109
ISSN0004-637X
Language英语
KeywordMagnetic Reconnection Shock Waves Sun: Coronal Mass Ejection (Cmes) Sun: Solar Wind
AbstractThe impact of an overtaking fast shock on a magnetic cloud (MC) is a pivotal process in CME-CME (CME: coronal mass ejection) interactions and CME-SIR (SIR: stream interaction region) interactions. MC with a strong and rotating magnetic field is usually deemed a crucial part of CMEs. To study the impact of a fast shock on an MC, we perform a 2.5 dimensional numerical magnetohydrodynamic simulation. Two cases are run in this study: without. and with. impact by fast shock. In the former case, the MC expands gradually from its initial state and drives a relatively slow magnetic reconnection with the ambient magnetic field. Analyses of forces near the core of the. MC as a whole body indicates that the solar gravity is quite small compared to the Lorentz force and the pressure gradient force. In the second run, a fast shock propagates, relative to the background plasma, at a speed twice that. of the perpendicular fast magnetosonic speed, catches up with and takes over the MC. Due to the penetration of the fast shock, the MC is highly compressed and heated, with the temperature growth rate enhanced by a factor of about 10 and the velocity increased to about half of the shock speed. The magnetic reconnection with ambient magnetic field is also sped up by a factor of two to four in reconnection rate as a result of the enhanced density of the current sheet, which is squeezed by the forward motion of the shocked MC.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5995
Collection空间科学部
Corresponding AuthorHe, JS (reprint author), Peking Univ, Sch Earth & Space Sci, 5 Yiheyuan Rd, Beijing 100871, Peoples R China.
Recommended Citation
GB/T 7714
Mao, Shoudi,He, Jiansen,Zhang, Lei,et al. Numerical Study of Erosion, Heating, and Acceleration of the Magnetic Cloud as Impacted by Fast Shock[J]. ASTROPHYSICAL JOURNAL,2017,842(2):109.
APA Mao, Shoudi,He, Jiansen,Zhang, Lei,Yang, Liping,Wang, Linghua,&He, JS .(2017).Numerical Study of Erosion, Heating, and Acceleration of the Magnetic Cloud as Impacted by Fast Shock.ASTROPHYSICAL JOURNAL,842(2),109.
MLA Mao, Shoudi,et al."Numerical Study of Erosion, Heating, and Acceleration of the Magnetic Cloud as Impacted by Fast Shock".ASTROPHYSICAL JOURNAL 842.2(2017):109.
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