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The relationship between the magnetic cloud boundary layer and the substorm expansion phase
Zuo, P. B.; Wei, F. S.; Feng, X. S.; Yang, F; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationSolar Physics
2007
Volume242Issue:40180Pages:167-185
ISSN0038-0938
Language英语
KeywordInter-planetary Shock Solar-wind Magnetospheric Substorms Ultraviolet Imager Events Voyager Maximum Plasma Fields Helios
AbstractThe magnetic cloud boundary layer (BL) is a disturbance structure that is located between the magnetic cloud and the ambient solar wind. In this study, we statistically analyze the characteristics of the magnetic field B (z) component (in GSM coordinates) inside the magnetic cloud boundary layers as well as the relationship between the magnetic cloud boundary layers and the magnetospheric substorms based on 35 typical BLs observed by Wind from 1995 to 2006. It is found that the magnetic field B-z components are more turbulent inside the BLs than those inside the adjacent sheath regions and the magnetic clouds. The substorm onsets are identified by the auroral breakups that are the most reliable substorm indicators by using the Polar UVI image data. The UVI data are available only for 17 BLs. The statistical analysis indicated that 9 of the 17 events triggered the substorms when BLs crossed the magnetosphere and that the southward field in the adjacent sheath region is a necessary condition for these triggering events. In addition, the SF-type BLs, which are named by their features of the B (z) components inside the BLs and adjacent sheath regions, can easily trigger the substorms during their passage of the magnetosphere. SF-type BLs are characterized by sustained strong southward magnetic fields persisting for at least 30 minutes in the adjacent sheath regions and at least one change in the polarity of the B (z) component inside the BL. In this study, 7 out of 8 such SF-type BL events triggered the substorm expansion phase, suggesting that the SF-type BLs are another important interplanetary disturbance source of substorms.
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/122/1082
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Zuo, P. B.,Wei, F. S.,Feng, X. S.,et al. The relationship between the magnetic cloud boundary layer and the substorm expansion phase[J]. Solar Physics,2007,242(40180):167-185.
APA Zuo, P. B.,Wei, F. S.,Feng, X. S.,Yang, F,&北京8701信箱.(2007).The relationship between the magnetic cloud boundary layer and the substorm expansion phase.Solar Physics,242(40180),167-185.
MLA Zuo, P. B.,et al."The relationship between the magnetic cloud boundary layer and the substorm expansion phase".Solar Physics 242.40180(2007):167-185.
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