Numerical Study of Erosion, Heating, and Acceleration of the Magnetic   Cloud as Impacted by Fast Shock

doi:10.3847/1538-4357/aa70e0

CORC > 北京大学 > 地球与空间科学学院

	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
刊名	ASTROPHYSICAL JOURNAL
	2017
关键词	magnetic reconnection shock waves Sun: coronal mass ejection (CMEs) Sun: solar wind CORONAL MASS EJECTIONS INTERPLANETARY SPACE GEOMAGNETIC STORMS COMPLEX EJECTA FLUX ROPES SIMULATION RECONNECTION HELIOSPHERE MAGNETOHYDRODYNAMICS PROPAGATION
DOI	10.3847/1538-4357/aa70e0
英文摘要	The 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.; NSFC [41574168, 41222032, 41231069, 41474147, 41674171, 41421003]; National Young Top-Notch Talent Program of China; SCI(E); ARTICLE; 2; 842
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/472745]
专题	地球与空间科学学院
推荐引用方式 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.
APA	Mao, Shoudi,He, Jiansen,Zhang, Lei,Yang, Liping,&Wang, Linghua.(2017).Numerical Study of Erosion, Heating, and Acceleration of the Magnetic Cloud as Impacted by Fast Shock.ASTROPHYSICAL JOURNAL.
MLA	Mao, Shoudi,et al."Numerical Study of Erosion, Heating, and Acceleration of the Magnetic Cloud as Impacted by Fast Shock".ASTROPHYSICAL JOURNAL (2017).