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【期刊论文】THEORETICAL ANALYSIS ON THE GEOEFFECTIVENESSOF A SHOCK OVERTAKING A PRECEDING MAGNETIC CLOUD
汪毓明, Y.M. WANG, P.Z. YE, S. WANG and M. XIONG
Solar Physics 216: 295~310, 2003.,-0001,():
-1年11月30日
The shock compression of the preexisting southward directed magnetic field can enhance a geomagnetic disturbance. A simple theoretical model is proposed to study the geoeffectiveness of a shock overtaking a preceding magnetic cloud. Our aim is to answer theoretically the question how deep the shock enters into the cloud when the event just reaches the maximum geoeffectiveness. The results suggest that the minimum value of Dst* decreases initially, then increases again while the shock propagates from the border to the center of the cloud. There is a position where the shock compression of the preceding cloud obtains the maximum geoeffectiveness. In different situations, the position is different. The higher the overtaking shock speed is, the deeper is this position, and the smaller is the corresponding Dst∗min. Some shortcomings of this theoretical model are also discussed.
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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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【期刊论文】MULTIPLE MAGNETIC CLOUDS IN INTERPLANETARY SPACE
汪毓明, Y.M. WANG, S. WANG and P.Z. YE
Solar Physics 211: 333~344, 2002.,-0001,():
-1年11月30日
An interplanetary magnetic cloud (MC) is usually considered the byproduct of a coronal mass ejection (CME). Due to the frequent occurrence of CMEs, multiple magnetic clouds (multi-MCs), in which one MC catches up with another, should be a relatively common phenomenon. A simple flux rope model is used to get the primary magnetic field features of multi-MCs. Results indicate that the magnetic field configuration of multi-MCs mainly depends on the magnetic field characteristics of each member of multi-MCs. It may be entirely different in another situation. Moreover, we fit the data from the Wind spacecraft by using this model. Comparing the model with the observations, we verify the existence of multi-MCs, and propose some suggestions for further work.
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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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汪毓明, Y.M. Wang, P.Z. Ye, S. Wang, and X.H. Xue
GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO.13, 1700, 2003,-0001,():
-1年11月30日
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