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【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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【期刊论文】THE INTERPLANETARY RESPONSES TO THE GREAT SOLAR ACTIVITIES IN LATE OCTOBER 2003
汪毓明, YUMING WANG, PINZHONG YE, GUIPING ZHOU, SHUJUAN WANG, S. WANG, YIHUA YAN and JINGXIU WANG
Solar Physics (2005) 226: 337~357,-0001,():
-1年11月30日
Based on the observations of the Sun and the interplanetary medium, a series of solaractivities in late October 2003 and their consequences are studied comprehensively. Thirteen X-rayflares with importance greater than M-class, six frontside halo coronal mass ejections (CMEs) withspan angle larger than 100◦ and three associated eruptions of filament materials are identified byexamining lots of solar observations from October 26 to 29. All these flares were associated with typeIII radio bursts, all the frontside halo CMEs were accompanied by type II or type II-like radio bursts.Particularly, among these activities, two major solar events caused two extraordinary enhancements(exceeding 1000 particles/(cm2 s−1 ster−1 Mev−1) of solar energetic particle (SEP) flux intensity nearthe Earth, two large ejecta with fast shocks preceding, and two great geomagnetic storms with Dstpeak value of −363 and −401 nT, respectively. By using a cross correlation technique and a forcefreecylindrical flux rope model, the October 29 magnetic cloud associated with the largest CME areanalyzed, including its orientation and the sign of its helicity. It is found that the helicity of the cloudis negative, contrary to the regular statistical pattern that negative- and positive-helical interplanetarymagnetic clouds would be expected to come from northern and southern solar hemisphere. Moreover, the relationship between the orientation of magnetic cloud and associated filament is discussed. Inaddition, some discussion concerning multiple-magnetic-cloud structures and SEP events is alsogiven.
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【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
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◦)
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汪毓明, Y.M. Wang, P.Z. Ye and S. Wang, G.P. Zhou and J.X. Wang
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 107, NO.A11, 1340, 2002,-0001,():
-1年11月30日
CME,, geomagnetic storm
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汪毓明, Yuming Wang, C.L. Shen, S. Wang, and P.Z. Ye
GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO.20, 2039, 2003,-0001,():
-1年11月30日
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