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Numerical magnetohydrodynamic experiments for testing the physical mechanisms of coronal mass ejections acceleration
Wu, S. T.; Zhang, T. X.; Tandberg-Hanssen, E.; Liu, Y.; Feng, X. S.; Tan, A. J.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationSolar Physics
2004
Volume225Issue:1Pages:157-175
ISSN0038-0938
Language英语
Keyword2 Dynamical Types Flux Rope Lasco Observations Magnetic-fields Flares Streamer Simulation Evolution System Model
AbstractAnalysis of observations from both space-borne (LASCO/SOHO, Skylab and Solar Maximum Mission) and ground-based (Mauna Loa Observatory) instruments show that there are two types of coronal mass ejections (CMEs), fast CMEs and slow CMEs. Fast CMEs start with a high initial speed, which remains more or less constant, while slow CMEs start with a low initial speed, but show a gradual acceleration. To explain the difference between the two types of CMEs, Low and Zhang (2002) proposed that it resulted from a difference in the initial topology of the magnetic fields associated with the underlying quiescent prominences, i.e., a normal prominence configuration will lead to a fast CME, while an inverse quiescent prominence results in a slow CME. In this paper we explore a different scenario to explain the existence of fast and slow CMEs. Postulating only an inverse topology for the quiescent prominences, we show that fast and slow CMEs result from different physical processes responsible for the destabilization of the coronal magnetic field and for the initiation and launching of the CME. We use a 2.5-D, time-dependent streamer and flux-rope magnetohydrodynamic (MHD) model (Wu and Guo, 1997) and investigate three initiation processes, viz. (1) injecting of magnetic flux into the flux-rope, thereby causing an additional Lorentz force that will destabilize the streamer and launch a CME (Wu et al., 1997, 1999); (2) draining of plasma from the flux-rope and triggering a magnetic buoyancy force that causes the flux-rope to lift and launch a CME; and (3) introducing additional heating into the flux-rope, thereby simulating an active-region flux-rope accompanied by a flare to launch a CME. We present 12 numerical tests using these three driving mechanisms either alone or in various combinations. The results show that both fast and slow CMEs can be obtained from an inverse prominence configuration subjected to one or more of these three different initiation processes.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1027
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Wu, S. T.,Zhang, T. X.,Tandberg-Hanssen, E.,et al. Numerical magnetohydrodynamic experiments for testing the physical mechanisms of coronal mass ejections acceleration[J]. Solar Physics,2004,225(1):157-175.
APA Wu, S. T..,Zhang, T. X..,Tandberg-Hanssen, E..,Liu, Y..,Feng, X. S..,...&北京8701信箱.(2004).Numerical magnetohydrodynamic experiments for testing the physical mechanisms of coronal mass ejections acceleration.Solar Physics,225(1),157-175.
MLA Wu, S. T.,et al."Numerical magnetohydrodynamic experiments for testing the physical mechanisms of coronal mass ejections acceleration".Solar Physics 225.1(2004):157-175.
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