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2005年08月01日

【期刊论文】MHD simulation of the formation and propagation of multiple magnetic clouds in the heliosphere

汪毓明， Y. Wang， H. Zheng， S. Wang， and P. Ye

A&A 434, 309～316 (2005)，-0001，（）：

-1年11月30日

A multiple-magnetic-cloud (Multi-MC) structure formed by the overtaking of two successive coronal mass ejections(CMEs) in the heliosphere is studied by using a 2.5-D MHD simulation. This simulation illustrates the process of the formationand propagation of two identical CMEs, which are ejected with speeds of 400km s−1 and 600 km s−1 respectively and initiallyseparated by 12h. The results show that it takes ～18h for the fast cloud to catch up with the preceding slow one, thenthe two clouds form a Multi-MC structure that arrives at 1 AU three days later. The fast cloud is slowed down significantlybecause of the blocking by the preceding slow one. This implies that the travel time of a Multi-MC structure is dominatedby the preceding slow cloud. Moreover, most primary observational characteristics of Multi-MC at 1 AU are well representedby the simulation. In addition, by combining observations, theoretical model and the simulation results, diﬀerences betweenMulti-MC and other types of in-situ observed double-flux-rope structure are addressed. A comparison of Multi-MC to coronalmass-ejection cannibalization near Sun is also given.

magnetohydrodynamics (， MHD)， -methods: numerical-Sun: coronal mass ejections (， CMEs)， -interplanetary medium-standards

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2005年08月01日

【期刊论文】DEFLECTION OF CORONALMASS EJECTION IN THE INTERPLANETARYMEDIUM

汪毓明， YUMING WANG， CHENGLONG SHEN， S. WANG and PINZHONG YE

Solar Physics 222: 329～343, 2004.，-0001，（）：

-1年11月30日

摘要

y than fast ones. This is consistent with the observational results obtained by Zhang et al. (2003), that all four Earth-encountered limb CMEs originated from the east. On the other hand, since the most of the EFHCMEs are fast events, the range of the longitude distribution given by the theoretical model is E40◦, W70◦, which is well consistent with the observational results (E40◦, W75◦)