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Direct calculation of the ring current distribution and magnetic structure seen by Cluster during geomagnetic storms
Shen, C.; Yang, Y. Y.; Rong, Z. J.; Li, X.; Dunlop, M.; Carr, C. M.; Liu, Z. X.; Baker, D. N.; Chen, Z. Q.; Ji, Y.; Zeng, G.; Shen, C (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2014
Volume119Issue:4Pages:2458-2465
ISSN2169-9380
Language英语
KeywordMultiple-point Measurements Magnetic Field Lines Field Line Curvature Magnetic Storms Ring Currents
AbstractMagnetic disturbances caused by the Earth's ring current, particularly during storm time activity, have a dominant effect on the geomagnetic field. Strong currents and large kinetic and magnetic energies can change considerably local field geometry and depress the ground geomagnetic field. The multispacecraft magnetic measurements of Cluster allow extensive in situ coverage of the ring current. We select 48 storm time Cluster crossing events to investigate the variation of the local current density distribution and magnetic configuration of the ring current. We find direct evidence for the existence of an inner, eastward flowing current in addition to the dominant westward current, in the ring plane. The radius of curvature of the magnetic field lines (MFLs) is found to be increasingly reduced at all local times during increasing storm activity, changing the resulting ring current magnetic geometry considerably, where the MFL configuration and the azimuthal current density distribution are asymmetric with the local time. During similar storm activity the radius of curvature of the local MFLs, R-c, is smallest on the nightside to duskside, medium on the dawnside, and largest on the dayside. This change in geometry may have significant influence on the spatial distribution of the particles with various energies in the plasmasphere, ring current, and radiation belts.
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/122/2758
Collection空间科学部
Corresponding AuthorShen, C (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Shen, C.,Yang, Y. Y.,Rong, Z. J.,et al. Direct calculation of the ring current distribution and magnetic structure seen by Cluster during geomagnetic storms[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2014,119(4):2458-2465.
APA Shen, C..,Yang, Y. Y..,Rong, Z. J..,Li, X..,Dunlop, M..,...&Shen, C .(2014).Direct calculation of the ring current distribution and magnetic structure seen by Cluster during geomagnetic storms.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,119(4),2458-2465.
MLA Shen, C.,et al."Direct calculation of the ring current distribution and magnetic structure seen by Cluster during geomagnetic storms".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 119.4(2014):2458-2465.
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