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The effect of the heliospheric current sheet on interplanetary shocks
Xie, Y. Q.; Wei, F. S.; Xiang, C. Q.; Feng, X. H.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationSolar Physics
2006
Volume238Issue:2Pages:377-390
ISSN0038-0938
Language英语
KeywordCoronal Mass Ejections Solar-wind Plasma Sheet Geomagnetic Storms Arrival Times Propagation Models Earth Geoeffectiveness Association
AbstractUsing 180 interplanetary (IP) shock events associated with coronal mass ejections (CMEs) during 1997 - 2005, we investigate the influence of the heliospheric current sheet (HCS) upon the propagation and geoeffectiveness of IP shocks. Our preliminary results are: ( 1) The majority of CME-driving IP shocks occurred near the HCS. ( 2) The numbers of shock events and related geomagnetic storms observed when the Earth and the solar source are located on the same side of the HCS, represented by f(SS) and f(SG), respectively, are obviously higher than those when the Earth and the solar source are located on the opposite sides of the HCS, denoted by f(OS) and f(OG), with f(SS)/ f(OS) = 126/54, f(SG)/ f(OG) = 91/ 36. ( 3) Parameter jumps across the shock fronts for the same-side events are also higher than those for the opposite-side events, and the stronger shocks (Delta V >= 200 km s(-1)) are mainly attributed to be same-side events, with f(SSh)/f(OSh) = 28/15, where f(SSh) and f(OSh) are numbers of stronger shocks which belong to same-side events and opposite-side events, respectively. ( 4) The level of the geomagnetic disturbances is higher for the same-side events than for the opposite-side events. The ratio of the number of intense magnetic storms (Dst < - 100) triggered by same-side events to those triggered by opposite-side events is 25/10. ( 5) We propose an empirical model to predict the arrival time of the shock at the Earth, whose accuracy is comparable to that of other prevailing models. These results show that the HCS is an important physical structure, which probably plays an important role in the propagation of interplanetary shocks and their geoeffectiveness.
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/122/1052
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Xie, Y. Q.,Wei, F. S.,Xiang, C. Q.,et al. The effect of the heliospheric current sheet on interplanetary shocks[J]. Solar Physics,2006,238(2):377-390.
APA Xie, Y. Q.,Wei, F. S.,Xiang, C. Q.,Feng, X. H.,&北京8701信箱.(2006).The effect of the heliospheric current sheet on interplanetary shocks.Solar Physics,238(2),377-390.
MLA Xie, Y. Q.,et al."The effect of the heliospheric current sheet on interplanetary shocks".Solar Physics 238.2(2006):377-390.
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