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Statistical relationship between solar wind conditions and geomagnetic storms in 1998-2008
Xu, D.; Chen, T.; Zhang, X. X.; Liu, Z.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationPlanetary and Space Science
2009
Volume57Issue:12Pages:1500-1513
ISSN0032-0633
Language英语
KeywordGeomagnetic Storms Solar Cycle Space Weather Solar Wind Structures Interplanetary Magnetic-field Corotating Interaction Regions Coronal Mass Ejections Stream Interfaces 1 Au Clouds Maximum Ulysses Evolution Origin
AbstractApplying ACE data and pressure-corrected Dst index (Dst*), annual distributions of solar wind structures detected at L1 point (the first Lagrangian point between solar-terrestrial interval) and correlations between solar wind structures and geomagnetic storms in 1998-2008 have been studied. It was found that, within the Earth's upstream solar wind, the dominant feature was interplanetary coronal mass ejections (ICMEs), primarily magnetic clouds, during solar maximum period but corotating interaction regions (CIRs) at solar minimum. During rising and declining phases, solar wind features became unstable for the complicated solar corona transition processes between the maximum and minimum phases, and there was a high CIR occurrence rate in 2003, the early period of the declining phase, for the Earth's upstream solar wind was dominated by high-speed southern coronal-hole outflows at that time. The occurrence rate of sector boundary crossing (SBC) events was evidently higher at the late half of declining phase and minimum period. ICMEs mainly centered on the maximum period but CIRs on all the declining phase. The occurrence rate of ICMEs was 1.3 times of that of CIRs, and more than half of ICMEs were magnetic clouds (MCs). Half of magnetic clouds could drive interplanetary shock and played a crucial role for geomagnetic storms generation, especially intense storms (Dst* <= 100 nT), in which 45% were jointly induced by sheath region and driving MC structure. Sixty percent of intense storms were totally induced by shock-driving MCs; moreover, 74% of intense storms were driven by magnetic clouds, 81% of them driven by ICMEs. Shock-driving MC was the most geoeffective interplanetary source for four fifths of it able to lead to storms and more than one-third to intense storms. The rest of intense storms (19%) were induced just by 3% of all detected CIRs, and most of CIRs (53%) were corresponding to nearly 40% moderate and small storms (-100 nT
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/122/1142
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Xu, D.,Chen, T.,Zhang, X. X.,et al. Statistical relationship between solar wind conditions and geomagnetic storms in 1998-2008[J]. Planetary and Space Science,2009,57(12):1500-1513.
APA Xu, D.,Chen, T.,Zhang, X. X.,Liu, Z.,&北京8701信箱.(2009).Statistical relationship between solar wind conditions and geomagnetic storms in 1998-2008.Planetary and Space Science,57(12),1500-1513.
MLA Xu, D.,et al."Statistical relationship between solar wind conditions and geomagnetic storms in 1998-2008".Planetary and Space Science 57.12(2009):1500-1513.
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